def setphi(self, phi):
"""
NAME:
setphi
PURPOSE:
set initial azimuth
INPUT:
phi - desired azimuth
OUTPUT:
(none)
HISTORY:
2010-08-01 - Written - Bovy (NYU)
BUGS:
Should perform check that this orbit has phi
"""
if len(self.vxvv) == 2:
raise AttributeError("One-dimensional orbit has no azimuth")
elif len(self.vxvv) == 3:
#Upgrade
vxvv = [self.vxvv[0], self.vxvv[1], self.vxvv[2], phi]
self.vxvv = vxvv
self._orb = planarROrbit(vxvv=vxvv)
elif len(self.vxvv) == 4:
self.vxvv[-1] = phi
self._orb.vxvv[-1] = phi
elif len(self.vxvv) == 5:
#Upgrade
vxvv = [
self.vxvv[0], self.vxvv[1], self.vxvv[2], self.vxvv[3],
self.vxvv[4], phi
]
self.vxvv = vxvv
self._orb = FullOrbit(vxvv=vxvv)
elif len(self.vxvv) == 6:
self.vxvv[-1] = phi
self._orb.vxvv[-1] = phi
def setphi(self,phi):
"""
NAME:
setphi
PURPOSE:
set initial azimuth
INPUT:
phi - desired azimuth
OUTPUT:
(none)
HISTORY:
2010-08-01 - Written - Bovy (NYU)
BUGS:
Should perform check that this orbit has phi
"""
if len(self.vxvv) == 2:
raise AttributeError("One-dimensional orbit has no azimuth")
elif len(self.vxvv) == 3:
#Upgrade
vxvv= [self.vxvv[0],self.vxvv[1],self.vxvv[2],phi]
self.vxvv= vxvv
self._orb= planarROrbit(vxvv=vxvv)
elif len(self.vxvv) == 4:
self.vxvv[-1]= phi
self._orb.vxvv[-1]= phi
elif len(self.vxvv) == 5:
#Upgrade
vxvv= [self.vxvv[0],self.vxvv[1],self.vxvv[2],self.vxvv[3],
self.vxvv[4],phi]
self.vxvv= vxvv
self._orb= FullOrbit(vxvv=vxvv)
elif len(self.vxvv) == 6:
self.vxvv[-1]= phi
self._orb.vxvv[-1]= phi
def __init__(self,vxvv=None,uvw=False,lb=False,
radec=False,vo=235.,ro=8.5,zo=0.025,
solarmotion='hogg'):
"""
NAME:
__init__
PURPOSE:
Initialize an Orbit instance
INPUT:
vxvv - initial conditions
3D can be either
1) in Galactocentric cylindrical coordinates [R,vR,vT(,z,vz,phi)]
2) [ra,dec,d,mu_ra, mu_dec,vlos] in [deg,deg,kpc,mas/yr,mas/yr,km/s] (all J2000.0; mu_ra = mu_ra * cos dec)
3) [ra,dec,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) (l,b,d,mu_l, mu_b, vlos) in [deg,deg,kpc,mas/yr,mas/yr,km/s) (all J2000.0; mu_l = mu_l * cos b)
5) [l,b,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) and 5) also work when leaving out b and mu_b/W
OPTIONAL INPUTS:
radec - if True, input is 2) (or 3) above
uvw - if True, velocities are UVW
lb - if True, input is 4) or 5) above
vo - circular velocity at ro
ro - distance from vantage point to GC (kpc)
zo - offset toward the NGP of the Sun wrt the plane (kpc)
solarmotion - 'hogg' or 'dehnen', or 'schoenrich', or value in
[-U,V,W]
OUTPUT:
instance
HISTORY:
2010-07-20 - Written - Bovy (NYU)
"""
if isinstance(solarmotion,str) and solarmotion.lower() == 'hogg':
vsolar= nu.array([-10.1,4.0,6.7])/vo
elif isinstance(solarmotion,str) and solarmotion.lower() == 'dehnen':
vsolar= nu.array([-10.,5.25,7.17])/vo
elif isinstance(solarmotion,str) \
and solarmotion.lower() == 'schoenrich':
vsolar= nu.array([-11.1,12.24,7.25])/vo
else:
vsolar= nu.array(solarmotion)/vo
if radec or lb:
if radec:
l,b= coords.radec_to_lb(vxvv[0],vxvv[1],degree=True)
elif len(vxvv) == 4:
l, b= vxvv[0], 0.
else:
l,b= vxvv[0],vxvv[1]
if uvw:
X,Y,Z= coords.lbd_to_XYZ(l,b,vxvv[2],degree=True)
vx= vxvv[3]
vy= vxvv[4]
vz= vxvv[5]
else:
if radec:
pmll, pmbb= coords.pmrapmdec_to_pmllpmbb(vxvv[3],vxvv[4],
vxvv[0],vxvv[1],
degree=True)
d, vlos= vxvv[2], vxvv[5]
elif len(vxvv) == 4:
pmll, pmbb= vxvv[2], 0.
d, vlos= vxvv[1], vxvv[3]
else:
pmll, pmbb= vxvv[3], vxvv[4]
d, vlos= vxvv[2], vxvv[5]
X,Y,Z,vx,vy,vz= coords.sphergal_to_rectgal(l,b,d,
vlos,pmll, pmbb,
degree=True)
X/= ro
Y/= ro
Z/= ro
vx/= vo
vy/= vo
vz/= vo
vsun= nu.array([0.,1.,0.,])+vsolar
R, phi, z= coords.XYZ_to_galcencyl(X,Y,Z,Zsun=zo/ro)
vR, vT,vz= coords.vxvyvz_to_galcencyl(vx,vy,vz,
R,phi,z,
vsun=vsun,galcen=True)
if lb and len(vxvv) == 4: vxvv= [R,vR,vT,phi]
else: vxvv= [R,vR,vT,z,vz,phi]
self.vxvv= vxvv
if len(vxvv) == 2:
self._orb= linearOrbit(vxvv=vxvv)
elif len(vxvv) == 3:
self._orb= planarROrbit(vxvv=vxvv)
elif len(vxvv) == 4:
self._orb= planarOrbit(vxvv=vxvv)
elif len(vxvv) == 5:
self._orb= RZOrbit(vxvv=vxvv)
elif len(vxvv) == 6:
self._orb= FullOrbit(vxvv=vxvv)
class Orbit:
"""General orbit class representing an orbit"""
def __init__(self,vxvv=None,uvw=False,lb=False,
radec=False,vo=235.,ro=8.5,zo=0.025,
solarmotion='hogg'):
"""
NAME:
__init__
PURPOSE:
Initialize an Orbit instance
INPUT:
vxvv - initial conditions
3D can be either
1) in Galactocentric cylindrical coordinates [R,vR,vT(,z,vz,phi)]
2) [ra,dec,d,mu_ra, mu_dec,vlos] in [deg,deg,kpc,mas/yr,mas/yr,km/s] (all J2000.0; mu_ra = mu_ra * cos dec)
3) [ra,dec,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) (l,b,d,mu_l, mu_b, vlos) in [deg,deg,kpc,mas/yr,mas/yr,km/s) (all J2000.0; mu_l = mu_l * cos b)
5) [l,b,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) and 5) also work when leaving out b and mu_b/W
OPTIONAL INPUTS:
radec - if True, input is 2) (or 3) above
uvw - if True, velocities are UVW
lb - if True, input is 4) or 5) above
vo - circular velocity at ro
ro - distance from vantage point to GC (kpc)
zo - offset toward the NGP of the Sun wrt the plane (kpc)
solarmotion - 'hogg' or 'dehnen', or 'schoenrich', or value in
[-U,V,W]
OUTPUT:
instance
HISTORY:
2010-07-20 - Written - Bovy (NYU)
"""
if isinstance(solarmotion,str) and solarmotion.lower() == 'hogg':
vsolar= nu.array([-10.1,4.0,6.7])/vo
elif isinstance(solarmotion,str) and solarmotion.lower() == 'dehnen':
vsolar= nu.array([-10.,5.25,7.17])/vo
elif isinstance(solarmotion,str) \
and solarmotion.lower() == 'schoenrich':
vsolar= nu.array([-11.1,12.24,7.25])/vo
else:
vsolar= nu.array(solarmotion)/vo
if radec or lb:
if radec:
l,b= coords.radec_to_lb(vxvv[0],vxvv[1],degree=True)
elif len(vxvv) == 4:
l, b= vxvv[0], 0.
else:
l,b= vxvv[0],vxvv[1]
if uvw:
X,Y,Z= coords.lbd_to_XYZ(l,b,vxvv[2],degree=True)
vx= vxvv[3]
vy= vxvv[4]
vz= vxvv[5]
else:
if radec:
pmll, pmbb= coords.pmrapmdec_to_pmllpmbb(vxvv[3],vxvv[4],
vxvv[0],vxvv[1],
degree=True)
d, vlos= vxvv[2], vxvv[5]
elif len(vxvv) == 4:
pmll, pmbb= vxvv[2], 0.
d, vlos= vxvv[1], vxvv[3]
else:
pmll, pmbb= vxvv[3], vxvv[4]
d, vlos= vxvv[2], vxvv[5]
X,Y,Z,vx,vy,vz= coords.sphergal_to_rectgal(l,b,d,
vlos,pmll, pmbb,
degree=True)
X/= ro
Y/= ro
Z/= ro
vx/= vo
vy/= vo
vz/= vo
vsun= nu.array([0.,1.,0.,])+vsolar
R, phi, z= coords.XYZ_to_galcencyl(X,Y,Z,Zsun=zo/ro)
vR, vT,vz= coords.vxvyvz_to_galcencyl(vx,vy,vz,
R,phi,z,
vsun=vsun,galcen=True)
if lb and len(vxvv) == 4: vxvv= [R,vR,vT,phi]
else: vxvv= [R,vR,vT,z,vz,phi]
self.vxvv= vxvv
if len(vxvv) == 2:
self._orb= linearOrbit(vxvv=vxvv)
elif len(vxvv) == 3:
self._orb= planarROrbit(vxvv=vxvv)
elif len(vxvv) == 4:
self._orb= planarOrbit(vxvv=vxvv)
elif len(vxvv) == 5:
self._orb= RZOrbit(vxvv=vxvv)
elif len(vxvv) == 6:
self._orb= FullOrbit(vxvv=vxvv)
def setphi(self,phi):
"""
NAME:
setphi
PURPOSE:
set initial azimuth
INPUT:
phi - desired azimuth
OUTPUT:
(none)
HISTORY:
2010-08-01 - Written - Bovy (NYU)
BUGS:
Should perform check that this orbit has phi
"""
if len(self.vxvv) == 2:
raise AttributeError("One-dimensional orbit has no azimuth")
elif len(self.vxvv) == 3:
#Upgrade
vxvv= [self.vxvv[0],self.vxvv[1],self.vxvv[2],phi]
self.vxvv= vxvv
self._orb= planarROrbit(vxvv=vxvv)
elif len(self.vxvv) == 4:
self.vxvv[-1]= phi
self._orb.vxvv[-1]= phi
elif len(self.vxvv) == 5:
#Upgrade
vxvv= [self.vxvv[0],self.vxvv[1],self.vxvv[2],self.vxvv[3],
self.vxvv[4],phi]
self.vxvv= vxvv
self._orb= FullOrbit(vxvv=vxvv)
elif len(self.vxvv) == 6:
self.vxvv[-1]= phi
self._orb.vxvv[-1]= phi
def dim(self):
"""
NAME:
dim
PURPOSE:
return the dimension of the problem
INPUT:
(none)
OUTPUT:
dimension
HISTORY:
2011-02-03 - Written - Bovy (NYU)
"""
if len(self.vxvv) == 2:
return 1
elif len(self.vxvv) == 3 or len(self.vxvv) == 4:
return 2
elif len(self.vxvv) == 5 or len(self.vxvv) == 6:
return 3
def integrate(self,t,pot,method='leapfrog_c'):
"""
NAME:
integrate
PURPOSE:
integrate the orbit
INPUT:
t - list of times at which to output (0 has to be in this!)
pot - potential instance or list of instances
method= 'odeint' for scipy's odeint or 'leapfrog' for a simple
leapfrog implementation
OUTPUT:
(none) (get the actual orbit using getOrbit()
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.integrate(t,pot,method=method)
def integrateBC(self,pot,bc=_zEqZeroBC,method='odeint'):
"""
NAME:
integrateBC
PURPOSE:
integrate the orbit subject to a final boundary condition
INPUT:
pot - potential instance or list of instances
bc= boundary condition, takes array of phase-space position (in the manner that is relevant to the type of Orbit) and outputs the condition that should be zero; default: z=0
method= 'odeint' for scipy's odeint integrator, 'leapfrog' for
a simple symplectic integrator
OUTPUT:
(Another Orbit instance,time at which BC is reached)
HISTORY:
2011-09-30
"""
o,tout= self._orb.integrateBC(pot,bc=bc,method=method)
return (Orbit(vxvv=o[1,:]),tout)
def reverse(self):
"""
NAME:
reverse
PURPOSE:
reverse an already integrated orbit (that is, make it go from end to beginning in t=0 to tend)
INPUT:
(none)
OUTPUT:
(none)
HISTORY:
2011-04-13 - Written - Bovy (NYU)
"""
if hasattr(self,'_orbInterp'): delattr(self,'_orbInterp')
if hasattr(self,'rs'): delattr(self,'rs')
sortindx = range(len(self._orb.t))
sortindx.sort(lambda x,y: cmp(self._orb.t[x],self._orb.t[y]),
reverse=True)
for ii in range(self._orb.orbit.shape[1]):
self._orb.orbit[:,ii]= self._orb.orbit[sortindx,ii]
return None
def getOrbit(self):
"""
NAME:
getOrbit
PURPOSE:
return a previously calculated orbit
INPUT:
(none)
OUTPUT:
array orbit[nt,nd]
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
return self._orb.getOrbit()
def E(self,*args,**kwargs):
"""
NAME:
E
PURPOSE:
calculate the energy
INPUT:
t - (optional) time at which to get the radius
pot= Potential instance or list of such instances
OUTPUT:
energy
HISTORY:
2010-09-15 - Written - Bovy (NYU)
"""
return self._orb.E(*args,**kwargs)
def L(self,*args,**kwargs):
"""
NAME:
L
PURPOSE:
calculate the angular momentum at time t
INPUT:
t - (optional) time at which to get the radius
OUTPUT:
angular momentum
HISTORY:
2010-09-15 - Written - Bovy (NYU)
"""
return self._orb.L(*args,**kwargs)
def Jacobi(self,*args,**kwargs):
"""
NAME:
Jacobi
PURPOSE:
calculate the Jacobi integral E - Omega L
INPUT:
t - (optional) time at which to get the radius
OmegaP= pattern speed
pot= potential instance or list of such instances
OUTPUT:
Jacobi integral
HISTORY:
2011-04-18 - Written - Bovy (NYU)
"""
return self._orb.Jacobi(*args,**kwargs)
def e(self,analytic=False,pot=None):
"""
NAME:
e
PURPOSE:
calculate the eccentricity
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
eccentricity
HISTORY:
2010-09-15 - Written - Bovy (NYU)
"""
return self._orb.e(analytic=analytic,pot=pot)
def rap(self,analytic=False,pot=None):
"""
NAME:
rap
PURPOSE:
calculate the apocenter radius
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
R_ap
HISTORY:
2010-09-20 - Written - Bovy (NYU)
"""
return self._orb.rap(analytic=analytic,pot=pot)
def rperi(self,analytic=False,pot=None):
"""
NAME:
rperi
PURPOSE:
calculate the pericenter radius
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
R_peri
HISTORY:
2010-09-20 - Written - Bovy (NYU)
"""
return self._orb.rperi(analytic=analytic,pot=pot)
def zmax(self,analytic=False,pot=None):
"""
NAME:
zmax
PURPOSE:
calculate the maximum vertical height
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
Z_max
HISTORY:
2010-09-20 - Written - Bovy (NYU)
"""
return self._orb.zmax(analytic=analytic,pot=pot)
def wp(self,pot=None):
"""
NAME:
wp
PURPOSE:
calculate the azimuthal angle
INPUT:
pot - potential
OUTPUT:
wp
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
return self._orb.wp(pot=pot)
def jr(self,pot=None,**kwargs):
"""
NAME:
jr
PURPOSE:
calculate the radial action
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
jr
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.JR(**kwargs)
def jp(self,pot=None,**kwargs):
"""
NAME:
jp
PURPOSE:
calculate the azimuthal action
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
jp
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Jphi(**kwargs)
def jz(self,pot=None,**kwargs):
"""
NAME:
jz
PURPOSE:
calculate the vertical action
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
jz
HISTORY:
2012-06-01 - Written - Bovy (IAS)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Jz(**kwargs)
def wr(self,pot=None,**kwargs):
"""
NAME:
wr
PURPOSE:
calculate the radial angle
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
wr
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.angleR(**kwargs)
def wz(self,pot=None,**kwargs):
"""
NAME:
wz
PURPOSE:
calculate the vertical angle
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
wz
HISTORY:
2012-06-01 - Written - Bovy (IAS)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.anglez(**kwargs)
def Tr(self,pot=None,**kwargs):
"""
NAME:
Tr
PURPOSE:
calculate the radial period
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tr
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.TR(**kwargs)
def Tp(self,pot=None,**kwargs):
"""
NAME:
Tp
PURPOSE:
calculate the radial period
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tp
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Tphi(**kwargs)
def TrTp(self,pot=None,**kwargs):
"""
NAME:
TrTp
PURPOSE:
the 'ratio' between the radial and azimuthal period Tr/Tphi*pi
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tr/Tp*pi
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.I(**kwargs)
def Tz(self,pot=None,**kwargs):
"""
NAME:
Tz
PURPOSE:
calculate the vertical period
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tz
HISTORY:
2012-06-01 - Written - Bovy (IAS)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Tz(**kwargs)
def R(self,*args,**kwargs):
"""
NAME:
R
PURPOSE:
return cylindrical radius at time t
INPUT:
t - (optional) time at which to get the radius
OUTPUT:
R(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.R(*args,**kwargs)
def vR(self,*args,**kwargs):
"""
NAME:
vR
PURPOSE:
return radial velocity at time t
INPUT:
t - (optional) time at which to get the radial velocity
OUTPUT:
vR(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vR(*args,**kwargs)
def vT(self,*args,**kwargs):
"""
NAME:
vT
PURPOSE:
return tangential velocity at time t
INPUT:
t - (optional) time at which to get the tangential velocity
OUTPUT:
vT(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vT(*args,**kwargs)
def z(self,*args,**kwargs):
"""
NAME:
z
PURPOSE:
return vertical height
INPUT:
t - (optional) time at which to get the vertical height
OUTPUT:
z(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.z(*args,**kwargs)
def vz(self,*args,**kwargs):
"""
NAME:
vz
PURPOSE:
return vertical velocity
INPUT:
t - (optional) time at which to get the vertical velocity
OUTPUT:
vz(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vz(*args,**kwargs)
def phi(self,*args,**kwargs):
"""
NAME:
phi
PURPOSE:
return azimuth
INPUT:
t - (optional) time at which to get the azimuth
OUTPUT:
phi(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.phi(*args,**kwargs)
def vphi(self,*args,**kwargs):
"""
NAME:
vphi
PURPOSE:
return angular velocity
INPUT:
t - (optional) time at which to get the angular velocity
OUTPUT:
vphi(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vphi(*args,**kwargs)
def x(self,*args,**kwargs):
"""
NAME:
x
PURPOSE:
return x
INPUT:
t - (optional) time at which to get x
OUTPUT:
x(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.x(*args,**kwargs)
def y(self,*args,**kwargs):
"""
NAME:
y
PURPOSE:
return y
INPUT:
t - (optional) time at which to get y
OUTPUT:
y(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.y(*args,**kwargs)
def vx(self,*args,**kwargs):
"""
NAME:
vx
PURPOSE:
return x velocity at time t
INPUT:
t - (optional) time at which to get the velocity
OUTPUT:
vx(t)
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
return self._orb.vx(*args,**kwargs)
def vy(self,*args,**kwargs):
"""
NAME:
vy
PURPOSE:
return y velocity at time t
INPUT:
t - (optional) time at which to get the velocity
OUTPUT:
vy(t)
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
return self._orb.vy(*args,**kwargs)
def ra(self,*args,**kwargs):
"""
NAME:
ra
PURPOSE:
return the right ascension
INPUT:
t - (optional) time at which to get ra
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
ra(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.ra(*args,**kwargs)
def dec(self,*args,**kwargs):
"""
NAME:
dec
PURPOSE:
return the declination
INPUT:
t - (optional) time at which to get dec
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
dec(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.dec(*args,**kwargs)
def ll(self,*args,**kwargs):
"""
NAME:
ll
PURPOSE:
return Galactic longitude
INPUT:
t - (optional) time at which to get ll
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
l(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.ll(*args,**kwargs)
def bb(self,*args,**kwargs):
"""
NAME:
bb
PURPOSE:
return Galactic latitude
INPUT:
t - (optional) time at which to get bb
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
b(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.bb(*args,**kwargs)
def dist(self,*args,**kwargs):
"""
NAME:
dist
PURPOSE:
return distance from the observer
INPUT:
t - (optional) time at which to get dist
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
dist(t) in kpc
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)
def pmra(self,*args,**kwargs):
"""
NAME:
pmra
PURPOSE:
return proper motion in right ascension (in mas/yr)
INPUT:
t - (optional) time at which to get pmra
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_ra(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmra(*args,**kwargs)
def pmdec(self,*args,**kwargs):
"""
NAME:
pmdec
PURPOSE:
return proper motion in declination (in mas/yr)
INPUT:
t - (optional) time at which to get pmdec
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_dec(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmdec(*args,**kwargs)
def pmll(self,*args,**kwargs):
"""
NAME:
pmll
PURPOSE:
return proper motion in Galactic longitude (in mas/yr)
INPUT:
t - (optional) time at which to get pmll
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_l(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmll(*args,**kwargs)
def pmbb(self,*args,**kwargs):
"""
NAME:
pmbb
PURPOSE:
return proper motion in Galactic latitude (in mas/yr)
INPUT:
t - (optional) time at which to get pmbb
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_b(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmbb(*args,**kwargs)
def vlos(self,*args,**kwargs):
"""
NAME:
vlos
PURPOSE:
return the line-of-sight velocity (in km/s)
INPUT:
t - (optional) time at which to get vlos
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
vlos(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.vlos(*args,**kwargs)
def vra(self,*args,**kwargs):
"""
NAME:
vra
PURPOSE:
return velocity in right ascension (km/s)
INPUT:
t - (optional) time at which to get pmra
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_ra(t) in km/s
HISTORY:
2011-03-27 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmra(*args,**kwargs)
def vdec(self,*args,**kwargs):
"""
NAME:
vdec
PURPOSE:
return velocity in declination (km/s)
INPUT:
t - (optional) time at which to get pmdec
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_dec(t) in km/s
HISTORY:
2011-03-27 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmdec(*args,**kwargs)
def vll(self,*args,**kwargs):
"""
NAME:
vll
PURPOSE:
return the velocity in Galactic longitude (km/s)
INPUT:
t - (optional) time at which to get pmll
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_l(t) in km/s
HISTORY:
2011-03-27 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmll(*args,**kwargs)
def vbb(self,*args,**kwargs):
"""
NAME:
vbb
PURPOSE:
return velocity in Galactic latitude (km/s)
INPUT:
t - (optional) time at which to get pmbb
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_b(t) in km/s
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmbb(*args,**kwargs)
def helioX(self,*args,**kwargs):
"""
NAME:
helioX
PURPOSE:
return Heliocentric Galactic rectangular x-coordinate (aka "X")
INPUT:
t - (optional) time at which to get X
obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
helioX(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.helioX(*args,**kwargs)
def helioY(self,*args,**kwargs):
"""
NAME:
helioY
PURPOSE:
return Heliocentric Galactic rectangular y-coordinate (aka "Y")
INPUT:
t - (optional) time at which to get Y
obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
helioY(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.helioY(*args,**kwargs)
def helioZ(self,*args,**kwargs):
"""
NAME:
helioZ
PURPOSE:
return Heliocentric Galactic rectangular z-coordinate (aka "Z")
INPUT:
t - (optional) time at which to get Z
obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
helioZ(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.helioZ(*args,**kwargs)
def U(self,*args,**kwargs):
"""
NAME:
U
PURPOSE:
return Heliocentric Galactic rectangular x-velocity (aka "U")
INPUT:
t - (optional) time at which to get U
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
U(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.U(*args,**kwargs)
def V(self,*args,**kwargs):
"""
NAME:
V
PURPOSE:
return Heliocentric Galactic rectangular y-velocity (aka "V")
INPUT:
t - (optional) time at which to get U
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
V(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.V(*args,**kwargs)
def W(self,*args,**kwargs):
"""
NAME:
W
PURPOSE:
return Heliocentric Galactic rectangular z-velocity (aka "W")
INPUT:
t - (optional) time at which to get W
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
W(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.W(*args,**kwargs)
def __call__(self,*args,**kwargs):
"""
NAME:
__call__
PURPOSE:
return the orbit at time t
INPUT:
t - desired time
rect - if true, return rectangular coordinates
OUTPUT:
an Orbit instance with initial condition set to the
phase-space at time t or list of Orbit instances if multiple
times are given
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
thiso= self._orb(*args,**kwargs)
if len(thiso.shape) == 1: return Orbit(vxvv=thiso)
else: return [Orbit(vxvv=thiso[:,ii]) for ii in range(thiso.shape[1])]
def plot(self,*args,**kwargs):
"""
NAME:
plot
PURPOSE:
plot a previously calculated orbit (with reasonable defaults)
INPUT:
d1= first dimension to plot ('x', 'y', 'R', 'vR', 'vT', 'z', 'vz', ...)
d2= second dimension to plot
matplotlib.plot inputs+bovy_plot.plot inputs
OUTPUT:
sends plot to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plot(*args,**kwargs)
def plot3d(self,*args,**kwargs):
"""
NAME:
plot3d
PURPOSE:
plot 3D aspects of an Orbit
INPUT:
bovy_plot3d args and kwargs
OUTPUT:
plot
HISTORY:
2010-07-26 - Written - Bovy (NYU)
2010-09-22 - Adapted to more general framework - Bovy (NYU)
2010-01-08 - Adapted to 3D - Bovy (NYU)
"""
self._orb.plot3d(*args,**kwargs)
def plotE(self,*args,**kwargs):
"""
NAME:
plotE
PURPOSE:
plot E(.) along the orbit
INPUT:
pot= - Potential instance or list of instances in which the orbit
was integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R', 'vR', 'vT', 'vz'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotE(*args,**kwargs)
def plotEz(self,*args,**kwargs):
"""
NAME:
plotEz
PURPOSE:
plot E_z(.) along the orbit
INPUT:
po= - Potential instance or list of instances in which the orbit was
integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotEz(*args,**kwargs)
def plotEzJz(self,*args,**kwargs):
"""
NAME:
plotEzJzt
PURPOSE:
plot E_z(t)/sqrt(dens(R)) along the orbit
INPUT:
pot - Potential instance or list of instances in which the orbit was
integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-08-08 - Written - Bovy (NYU)
"""
self._orb.plotEzJz(*args,**kwargs)
def plotJacobi(self,*args,**kwargs):
"""
NAME:
plotJacobi
PURPOSE:
plot the Jacobi integral along the orbit
INPUT:
OmegaP= pattern speed
pot= - Potential instance or list of instances in which the orbit
was integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R', 'vR', 'vT', 'vz'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2011-10-10 - Written - Bovy (IAS)
"""
self._orb.plotJacobi(*args,**kwargs)
def plotR(self,*args,**kwargs):
"""
NAME:
plotR
PURPOSE:
plot R(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotR(*args,**kwargs)
def plotz(self,*args,**kwargs):
"""
NAME:
plotz
PURPOSE:
plot z(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotz(*args,**kwargs)
def plotvR(self,*args,**kwargs):
"""
NAME:
plotvR
PURPOSE:
plot vR(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotvR(*args,**kwargs)
def plotvT(self,*args,**kwargs):
"""
NAME:
plotvT
PURPOSE:
plot vT(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotvT(*args,**kwargs)
def plotphi(self,*args,**kwargs):
"""
NAME:
plotphi
PURPOSE:
plot \phi(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotphi(*args,**kwargs)
def plotvz(self,*args,**kwargs):
"""
NAME:
plotvz
PURPOSE:
plot vz(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotvz(*args,**kwargs)
def plotx(self,*args,**kwargs):
"""
NAME:
plotx
PURPOSE:
plot a one-dimensional orbit position
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.plotx(*args,**kwargs)
def plotvx(self,*args,**kwargs):
"""
NAME:
plotvx
PURPOSE:
plot a one-dimensional orbit velocity
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.plotvx(*args,**kwargs)
def ploty(self,*args,**kwargs):
"""
NAME:
ploty
PURPOSE:
plot a one-dimensional orbit position
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.ploty(*args,**kwargs)
def plotvy(self,*args,**kwargs):
"""
NAME:
plotvy
PURPOSE:
plot a one-dimensional orbit velocity
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.plotvy(*args,**kwargs)
def toPlanar(self):
"""
NAME:
toPlanar
PURPOSE:
convert a 3D orbit into a 2D orbit
INPUT:
(none)
OUTPUT:
planar Orbit
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
if len(self.vxvv) == 6:
vxvv= [self.vxvv[0],self.vxvv[1],self.vxvv[2],self.vxvv[5]]
elif len(self.vxvv) == 5:
vxvv= [self.vxvv[0],self.vxvv[1],self.vxvv[2]]
else:
raise AttributeError("planar or linear Orbits do not have the toPlanar attribute")
return Orbit(vxvv=vxvv)
def toLinear(self):
"""
NAME:
toLinear
PURPOSE:
convert a 3D orbit into a 1D orbit (z)
INPUT:
(none)
OUTPUT:
linear Orbit
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
if len(self.vxvv) == 6 or len(self.vxvv) == 5:
vxvv= [self.vxvv[3],self.vxvv[4]]
else:
raise AttributeError("planar or linear Orbits do not have the toPlanar attribute")
return Orbit(vxvv=vxvv)
def __add__(self,linOrb):
"""
NAME:
__add__
PURPOSE:
add a linear orbit and a planar orbit to make a 3D orbit
INPUT:
linear or plane orbit instance
OUTPUT:
3D orbit
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
if (not (isinstance(self._orb,planarROrbit) and
isinstance(linOrb._orb,linearOrbit)) and
not (isinstance(self._orb,linearOrbit) and
isinstance(linOrb._orb,planarROrbit))):
raise AttributeError("Only planarROrbit+linearOrbit is supported")
if isinstance(self._orb,planarROrbit):
return Orbit(vxvv=[self._orb.vxvv[0],self._orb.vxvv[1],
self._orb.vxvv[2],
linOrb._orb.vxvv[0],linOrb._orb.vxvv[1]])
else:
return Orbit(vxvv=[linOrb._orb.vxvv[0],linOrb._orb.vxvv[1],
linOrb._orb.vxvv[2],
self._orb.vxvv[0],self._orb.vxvv[1]])
#4 pickling
def __getinitargs__(self):
return (self.vxvv,)
def __getstate__(self):
return self.vxvv
def __setstate__(self,state):
self.vxvv= state
def __init__(self,
vxvv=None,
uvw=False,
lb=False,
radec=False,
vo=235.,
ro=8.5,
zo=0.025,
solarmotion='hogg'):
"""
NAME:
__init__
PURPOSE:
Initialize an Orbit instance
INPUT:
vxvv - initial conditions
3D can be either
1) in Galactocentric cylindrical coordinates [R,vR,vT(,z,vz,phi)]
2) [ra,dec,d,mu_ra, mu_dec,vlos] in [deg,deg,kpc,mas/yr,mas/yr,km/s] (all J2000.0; mu_ra = mu_ra * cos dec)
3) [ra,dec,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) (l,b,d,mu_l, mu_b, vlos) in [deg,deg,kpc,mas/yr,mas/yr,km/s) (all J2000.0; mu_l = mu_l * cos b)
5) [l,b,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) and 5) also work when leaving out b and mu_b/W
OPTIONAL INPUTS:
radec - if True, input is 2) (or 3) above
uvw - if True, velocities are UVW
lb - if True, input is 4) or 5) above
vo - circular velocity at ro
ro - distance from vantage point to GC (kpc)
zo - offset toward the NGP of the Sun wrt the plane (kpc)
solarmotion - 'hogg' or 'dehnen', or 'schoenrich', or value in
[-U,V,W]
OUTPUT:
instance
HISTORY:
2010-07-20 - Written - Bovy (NYU)
"""
if isinstance(solarmotion, str) and solarmotion.lower() == 'hogg':
vsolar = nu.array([-10.1, 4.0, 6.7]) / vo
elif isinstance(solarmotion, str) and solarmotion.lower() == 'dehnen':
vsolar = nu.array([-10., 5.25, 7.17]) / vo
elif isinstance(solarmotion,str) \
and solarmotion.lower() == 'schoenrich':
vsolar = nu.array([-11.1, 12.24, 7.25]) / vo
else:
vsolar = nu.array(solarmotion) / vo
if radec or lb:
if radec:
l, b = coords.radec_to_lb(vxvv[0], vxvv[1], degree=True)
elif len(vxvv) == 4:
l, b = vxvv[0], 0.
else:
l, b = vxvv[0], vxvv[1]
if uvw:
X, Y, Z = coords.lbd_to_XYZ(l, b, vxvv[2], degree=True)
vx = vxvv[3]
vy = vxvv[4]
vz = vxvv[5]
else:
if radec:
pmll, pmbb = coords.pmrapmdec_to_pmllpmbb(vxvv[3],
vxvv[4],
vxvv[0],
vxvv[1],
degree=True)
d, vlos = vxvv[2], vxvv[5]
elif len(vxvv) == 4:
pmll, pmbb = vxvv[2], 0.
d, vlos = vxvv[1], vxvv[3]
else:
pmll, pmbb = vxvv[3], vxvv[4]
d, vlos = vxvv[2], vxvv[5]
X, Y, Z, vx, vy, vz = coords.sphergal_to_rectgal(l,
b,
d,
vlos,
pmll,
pmbb,
degree=True)
X /= ro
Y /= ro
Z /= ro
vx /= vo
vy /= vo
vz /= vo
vsun = nu.array([
0.,
1.,
0.,
]) + vsolar
R, phi, z = coords.XYZ_to_galcencyl(X, Y, Z, Zsun=zo / ro)
vR, vT, vz = coords.vxvyvz_to_galcencyl(vx,
vy,
vz,
R,
phi,
z,
vsun=vsun,
galcen=True)
if lb and len(vxvv) == 4: vxvv = [R, vR, vT, phi]
else: vxvv = [R, vR, vT, z, vz, phi]
self.vxvv = vxvv
if len(vxvv) == 2:
self._orb = linearOrbit(vxvv=vxvv)
elif len(vxvv) == 3:
self._orb = planarROrbit(vxvv=vxvv)
elif len(vxvv) == 4:
self._orb = planarOrbit(vxvv=vxvv)
elif len(vxvv) == 5:
self._orb = RZOrbit(vxvv=vxvv)
elif len(vxvv) == 6:
self._orb = FullOrbit(vxvv=vxvv)
class Orbit:
"""General orbit class representing an orbit"""
def __init__(self,
vxvv=None,
uvw=False,
lb=False,
radec=False,
vo=235.,
ro=8.5,
zo=0.025,
solarmotion='hogg'):
"""
NAME:
__init__
PURPOSE:
Initialize an Orbit instance
INPUT:
vxvv - initial conditions
3D can be either
1) in Galactocentric cylindrical coordinates [R,vR,vT(,z,vz,phi)]
2) [ra,dec,d,mu_ra, mu_dec,vlos] in [deg,deg,kpc,mas/yr,mas/yr,km/s] (all J2000.0; mu_ra = mu_ra * cos dec)
3) [ra,dec,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) (l,b,d,mu_l, mu_b, vlos) in [deg,deg,kpc,mas/yr,mas/yr,km/s) (all J2000.0; mu_l = mu_l * cos b)
5) [l,b,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) and 5) also work when leaving out b and mu_b/W
OPTIONAL INPUTS:
radec - if True, input is 2) (or 3) above
uvw - if True, velocities are UVW
lb - if True, input is 4) or 5) above
vo - circular velocity at ro
ro - distance from vantage point to GC (kpc)
zo - offset toward the NGP of the Sun wrt the plane (kpc)
solarmotion - 'hogg' or 'dehnen', or 'schoenrich', or value in
[-U,V,W]
OUTPUT:
instance
HISTORY:
2010-07-20 - Written - Bovy (NYU)
"""
if isinstance(solarmotion, str) and solarmotion.lower() == 'hogg':
vsolar = nu.array([-10.1, 4.0, 6.7]) / vo
elif isinstance(solarmotion, str) and solarmotion.lower() == 'dehnen':
vsolar = nu.array([-10., 5.25, 7.17]) / vo
elif isinstance(solarmotion,str) \
and solarmotion.lower() == 'schoenrich':
vsolar = nu.array([-11.1, 12.24, 7.25]) / vo
else:
vsolar = nu.array(solarmotion) / vo
if radec or lb:
if radec:
l, b = coords.radec_to_lb(vxvv[0], vxvv[1], degree=True)
elif len(vxvv) == 4:
l, b = vxvv[0], 0.
else:
l, b = vxvv[0], vxvv[1]
if uvw:
X, Y, Z = coords.lbd_to_XYZ(l, b, vxvv[2], degree=True)
vx = vxvv[3]
vy = vxvv[4]
vz = vxvv[5]
else:
if radec:
pmll, pmbb = coords.pmrapmdec_to_pmllpmbb(vxvv[3],
vxvv[4],
vxvv[0],
vxvv[1],
degree=True)
d, vlos = vxvv[2], vxvv[5]
elif len(vxvv) == 4:
pmll, pmbb = vxvv[2], 0.
d, vlos = vxvv[1], vxvv[3]
else:
pmll, pmbb = vxvv[3], vxvv[4]
d, vlos = vxvv[2], vxvv[5]
X, Y, Z, vx, vy, vz = coords.sphergal_to_rectgal(l,
b,
d,
vlos,
pmll,
pmbb,
degree=True)
X /= ro
Y /= ro
Z /= ro
vx /= vo
vy /= vo
vz /= vo
vsun = nu.array([
0.,
1.,
0.,
]) + vsolar
R, phi, z = coords.XYZ_to_galcencyl(X, Y, Z, Zsun=zo / ro)
vR, vT, vz = coords.vxvyvz_to_galcencyl(vx,
vy,
vz,
R,
phi,
z,
vsun=vsun,
galcen=True)
if lb and len(vxvv) == 4: vxvv = [R, vR, vT, phi]
else: vxvv = [R, vR, vT, z, vz, phi]
self.vxvv = vxvv
if len(vxvv) == 2:
self._orb = linearOrbit(vxvv=vxvv)
elif len(vxvv) == 3:
self._orb = planarROrbit(vxvv=vxvv)
elif len(vxvv) == 4:
self._orb = planarOrbit(vxvv=vxvv)
elif len(vxvv) == 5:
self._orb = RZOrbit(vxvv=vxvv)
elif len(vxvv) == 6:
self._orb = FullOrbit(vxvv=vxvv)
def setphi(self, phi):
"""
NAME:
setphi
PURPOSE:
set initial azimuth
INPUT:
phi - desired azimuth
OUTPUT:
(none)
HISTORY:
2010-08-01 - Written - Bovy (NYU)
BUGS:
Should perform check that this orbit has phi
"""
if len(self.vxvv) == 2:
raise AttributeError("One-dimensional orbit has no azimuth")
elif len(self.vxvv) == 3:
#Upgrade
vxvv = [self.vxvv[0], self.vxvv[1], self.vxvv[2], phi]
self.vxvv = vxvv
self._orb = planarROrbit(vxvv=vxvv)
elif len(self.vxvv) == 4:
self.vxvv[-1] = phi
self._orb.vxvv[-1] = phi
elif len(self.vxvv) == 5:
#Upgrade
vxvv = [
self.vxvv[0], self.vxvv[1], self.vxvv[2], self.vxvv[3],
self.vxvv[4], phi
]
self.vxvv = vxvv
self._orb = FullOrbit(vxvv=vxvv)
elif len(self.vxvv) == 6:
self.vxvv[-1] = phi
self._orb.vxvv[-1] = phi
def dim(self):
"""
NAME:
dim
PURPOSE:
return the dimension of the problem
INPUT:
(none)
OUTPUT:
dimension
HISTORY:
2011-02-03 - Written - Bovy (NYU)
"""
if len(self.vxvv) == 2:
return 1
elif len(self.vxvv) == 3 or len(self.vxvv) == 4:
return 2
elif len(self.vxvv) == 5 or len(self.vxvv) == 6:
return 3
def integrate(self, t, pot, method='leapfrog_c'):
"""
NAME:
integrate
PURPOSE:
integrate the orbit
INPUT:
t - list of times at which to output (0 has to be in this!)
pot - potential instance or list of instances
method= 'odeint' for scipy's odeint or 'leapfrog' for a simple
leapfrog implementation
OUTPUT:
(none) (get the actual orbit using getOrbit()
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.integrate(t, pot, method=method)
def integrateBC(self, pot, bc=_zEqZeroBC, method='odeint'):
"""
NAME:
integrateBC
PURPOSE:
integrate the orbit subject to a final boundary condition
INPUT:
pot - potential instance or list of instances
bc= boundary condition, takes array of phase-space position (in the manner that is relevant to the type of Orbit) and outputs the condition that should be zero; default: z=0
method= 'odeint' for scipy's odeint integrator, 'leapfrog' for
a simple symplectic integrator
OUTPUT:
(Another Orbit instance,time at which BC is reached)
HISTORY:
2011-09-30
"""
o, tout = self._orb.integrateBC(pot, bc=bc, method=method)
return (Orbit(vxvv=o[1, :]), tout)
def reverse(self):
"""
NAME:
reverse
PURPOSE:
reverse an already integrated orbit (that is, make it go from end to beginning in t=0 to tend)
INPUT:
(none)
OUTPUT:
(none)
HISTORY:
2011-04-13 - Written - Bovy (NYU)
"""
if hasattr(self, '_orbInterp'): delattr(self, '_orbInterp')
if hasattr(self, 'rs'): delattr(self, 'rs')
sortindx = range(len(self._orb.t))
sortindx.sort(lambda x, y: cmp(self._orb.t[x], self._orb.t[y]),
reverse=True)
for ii in range(self._orb.orbit.shape[1]):
self._orb.orbit[:, ii] = self._orb.orbit[sortindx, ii]
return None
def getOrbit(self):
"""
NAME:
getOrbit
PURPOSE:
return a previously calculated orbit
INPUT:
(none)
OUTPUT:
array orbit[nt,nd]
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
return self._orb.getOrbit()
def E(self, *args, **kwargs):
"""
NAME:
E
PURPOSE:
calculate the energy
INPUT:
t - (optional) time at which to get the radius
pot= Potential instance or list of such instances
OUTPUT:
energy
HISTORY:
2010-09-15 - Written - Bovy (NYU)
"""
return self._orb.E(*args, **kwargs)
def L(self, *args, **kwargs):
"""
NAME:
L
PURPOSE:
calculate the angular momentum at time t
INPUT:
t - (optional) time at which to get the radius
OUTPUT:
angular momentum
HISTORY:
2010-09-15 - Written - Bovy (NYU)
"""
return self._orb.L(*args, **kwargs)
def Jacobi(self, *args, **kwargs):
"""
NAME:
Jacobi
PURPOSE:
calculate the Jacobi integral E - Omega L
INPUT:
t - (optional) time at which to get the radius
OmegaP= pattern speed
pot= potential instance or list of such instances
OUTPUT:
Jacobi integral
HISTORY:
2011-04-18 - Written - Bovy (NYU)
"""
return self._orb.Jacobi(*args, **kwargs)
def e(self, analytic=False, pot=None):
"""
NAME:
e
PURPOSE:
calculate the eccentricity
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
eccentricity
HISTORY:
2010-09-15 - Written - Bovy (NYU)
"""
return self._orb.e(analytic=analytic, pot=pot)
def rap(self, analytic=False, pot=None):
"""
NAME:
rap
PURPOSE:
calculate the apocenter radius
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
R_ap
HISTORY:
2010-09-20 - Written - Bovy (NYU)
"""
return self._orb.rap(analytic=analytic, pot=pot)
def rperi(self, analytic=False, pot=None):
"""
NAME:
rperi
PURPOSE:
calculate the pericenter radius
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
R_peri
HISTORY:
2010-09-20 - Written - Bovy (NYU)
"""
return self._orb.rperi(analytic=analytic, pot=pot)
def zmax(self, analytic=False, pot=None):
"""
NAME:
zmax
PURPOSE:
calculate the maximum vertical height
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
OUTPUT:
Z_max
HISTORY:
2010-09-20 - Written - Bovy (NYU)
"""
return self._orb.zmax(analytic=analytic, pot=pot)
def wp(self, pot=None):
"""
NAME:
wp
PURPOSE:
calculate the azimuthal angle
INPUT:
pot - potential
OUTPUT:
wp
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
return self._orb.wp(pot=pot)
def jr(self, pot=None, **kwargs):
"""
NAME:
jr
PURPOSE:
calculate the radial action
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
jr
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.JR(**kwargs)
def jp(self, pot=None, **kwargs):
"""
NAME:
jp
PURPOSE:
calculate the azimuthal action
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
jp
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Jphi(**kwargs)
def jz(self, pot=None, **kwargs):
"""
NAME:
jz
PURPOSE:
calculate the vertical action
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
jz
HISTORY:
2012-06-01 - Written - Bovy (IAS)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Jz(**kwargs)
def wr(self, pot=None, **kwargs):
"""
NAME:
wr
PURPOSE:
calculate the radial angle
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
wr
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.angleR(**kwargs)
def wz(self, pot=None, **kwargs):
"""
NAME:
wz
PURPOSE:
calculate the vertical angle
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
wz
HISTORY:
2012-06-01 - Written - Bovy (IAS)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.anglez(**kwargs)
def Tr(self, pot=None, **kwargs):
"""
NAME:
Tr
PURPOSE:
calculate the radial period
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tr
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.TR(**kwargs)
def Tp(self, pot=None, **kwargs):
"""
NAME:
Tp
PURPOSE:
calculate the radial period
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tp
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Tphi(**kwargs)
def TrTp(self, pot=None, **kwargs):
"""
NAME:
TrTp
PURPOSE:
the 'ratio' between the radial and azimuthal period Tr/Tphi*pi
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tr/Tp*pi
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.I(**kwargs)
def Tz(self, pot=None, **kwargs):
"""
NAME:
Tz
PURPOSE:
calculate the vertical period
INPUT:
pot - potential
+scipy.integrate.quadrature keywords
OUTPUT:
Tz
HISTORY:
2012-06-01 - Written - Bovy (IAS)
"""
self._orb._setupaA(pot=pot)
return self._orb._aA.Tz(**kwargs)
def R(self, *args, **kwargs):
"""
NAME:
R
PURPOSE:
return cylindrical radius at time t
INPUT:
t - (optional) time at which to get the radius
OUTPUT:
R(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.R(*args, **kwargs)
def vR(self, *args, **kwargs):
"""
NAME:
vR
PURPOSE:
return radial velocity at time t
INPUT:
t - (optional) time at which to get the radial velocity
OUTPUT:
vR(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vR(*args, **kwargs)
def vT(self, *args, **kwargs):
"""
NAME:
vT
PURPOSE:
return tangential velocity at time t
INPUT:
t - (optional) time at which to get the tangential velocity
OUTPUT:
vT(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vT(*args, **kwargs)
def z(self, *args, **kwargs):
"""
NAME:
z
PURPOSE:
return vertical height
INPUT:
t - (optional) time at which to get the vertical height
OUTPUT:
z(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.z(*args, **kwargs)
def vz(self, *args, **kwargs):
"""
NAME:
vz
PURPOSE:
return vertical velocity
INPUT:
t - (optional) time at which to get the vertical velocity
OUTPUT:
vz(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vz(*args, **kwargs)
def phi(self, *args, **kwargs):
"""
NAME:
phi
PURPOSE:
return azimuth
INPUT:
t - (optional) time at which to get the azimuth
OUTPUT:
phi(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.phi(*args, **kwargs)
def vphi(self, *args, **kwargs):
"""
NAME:
vphi
PURPOSE:
return angular velocity
INPUT:
t - (optional) time at which to get the angular velocity
OUTPUT:
vphi(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.vphi(*args, **kwargs)
def x(self, *args, **kwargs):
"""
NAME:
x
PURPOSE:
return x
INPUT:
t - (optional) time at which to get x
OUTPUT:
x(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.x(*args, **kwargs)
def y(self, *args, **kwargs):
"""
NAME:
y
PURPOSE:
return y
INPUT:
t - (optional) time at which to get y
OUTPUT:
y(t)
HISTORY:
2010-09-21 - Written - Bovy (NYU)
"""
return self._orb.y(*args, **kwargs)
def vx(self, *args, **kwargs):
"""
NAME:
vx
PURPOSE:
return x velocity at time t
INPUT:
t - (optional) time at which to get the velocity
OUTPUT:
vx(t)
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
return self._orb.vx(*args, **kwargs)
def vy(self, *args, **kwargs):
"""
NAME:
vy
PURPOSE:
return y velocity at time t
INPUT:
t - (optional) time at which to get the velocity
OUTPUT:
vy(t)
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
return self._orb.vy(*args, **kwargs)
def ra(self, *args, **kwargs):
"""
NAME:
ra
PURPOSE:
return the right ascension
INPUT:
t - (optional) time at which to get ra
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
ra(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.ra(*args, **kwargs)
def dec(self, *args, **kwargs):
"""
NAME:
dec
PURPOSE:
return the declination
INPUT:
t - (optional) time at which to get dec
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
dec(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.dec(*args, **kwargs)
def ll(self, *args, **kwargs):
"""
NAME:
ll
PURPOSE:
return Galactic longitude
INPUT:
t - (optional) time at which to get ll
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
l(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.ll(*args, **kwargs)
def bb(self, *args, **kwargs):
"""
NAME:
bb
PURPOSE:
return Galactic latitude
INPUT:
t - (optional) time at which to get bb
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
b(t)
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.bb(*args, **kwargs)
def dist(self, *args, **kwargs):
"""
NAME:
dist
PURPOSE:
return distance from the observer
INPUT:
t - (optional) time at which to get dist
obs=[X,Y,Z] - (optional) position of observer (in kpc)
(default=[8.5,0.,0.]) OR Orbit object that corresponds to the orbit of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
dist(t) in kpc
HISTORY:
2011-02-23 - Written - Bovy (NYU)
"""
return self._orb.dist(*args, **kwargs)
def pmra(self, *args, **kwargs):
"""
NAME:
pmra
PURPOSE:
return proper motion in right ascension (in mas/yr)
INPUT:
t - (optional) time at which to get pmra
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_ra(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmra(*args, **kwargs)
def pmdec(self, *args, **kwargs):
"""
NAME:
pmdec
PURPOSE:
return proper motion in declination (in mas/yr)
INPUT:
t - (optional) time at which to get pmdec
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_dec(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmdec(*args, **kwargs)
def pmll(self, *args, **kwargs):
"""
NAME:
pmll
PURPOSE:
return proper motion in Galactic longitude (in mas/yr)
INPUT:
t - (optional) time at which to get pmll
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_l(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmll(*args, **kwargs)
def pmbb(self, *args, **kwargs):
"""
NAME:
pmbb
PURPOSE:
return proper motion in Galactic latitude (in mas/yr)
INPUT:
t - (optional) time at which to get pmbb
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
pm_b(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.pmbb(*args, **kwargs)
def vlos(self, *args, **kwargs):
"""
NAME:
vlos
PURPOSE:
return the line-of-sight velocity (in km/s)
INPUT:
t - (optional) time at which to get vlos
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
vlos(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.vlos(*args, **kwargs)
def vra(self, *args, **kwargs):
"""
NAME:
vra
PURPOSE:
return velocity in right ascension (km/s)
INPUT:
t - (optional) time at which to get pmra
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_ra(t) in km/s
HISTORY:
2011-03-27 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmra(*args,**kwargs)
def vdec(self, *args, **kwargs):
"""
NAME:
vdec
PURPOSE:
return velocity in declination (km/s)
INPUT:
t - (optional) time at which to get pmdec
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_dec(t) in km/s
HISTORY:
2011-03-27 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmdec(*args,**kwargs)
def vll(self, *args, **kwargs):
"""
NAME:
vll
PURPOSE:
return the velocity in Galactic longitude (km/s)
INPUT:
t - (optional) time at which to get pmll
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_l(t) in km/s
HISTORY:
2011-03-27 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmll(*args,**kwargs)
def vbb(self, *args, **kwargs):
"""
NAME:
vbb
PURPOSE:
return velocity in Galactic latitude (km/s)
INPUT:
t - (optional) time at which to get pmbb
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
v_b(t) in km/s
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.dist(*args,**kwargs)*_K*\
self._orb.pmbb(*args,**kwargs)
def helioX(self, *args, **kwargs):
"""
NAME:
helioX
PURPOSE:
return Heliocentric Galactic rectangular x-coordinate (aka "X")
INPUT:
t - (optional) time at which to get X
obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
helioX(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.helioX(*args, **kwargs)
def helioY(self, *args, **kwargs):
"""
NAME:
helioY
PURPOSE:
return Heliocentric Galactic rectangular y-coordinate (aka "Y")
INPUT:
t - (optional) time at which to get Y
obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
helioY(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.helioY(*args, **kwargs)
def helioZ(self, *args, **kwargs):
"""
NAME:
helioZ
PURPOSE:
return Heliocentric Galactic rectangular z-coordinate (aka "Z")
INPUT:
t - (optional) time at which to get Z
obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
OUTPUT:
helioZ(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.helioZ(*args, **kwargs)
def U(self, *args, **kwargs):
"""
NAME:
U
PURPOSE:
return Heliocentric Galactic rectangular x-velocity (aka "U")
INPUT:
t - (optional) time at which to get U
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
U(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.U(*args, **kwargs)
def V(self, *args, **kwargs):
"""
NAME:
V
PURPOSE:
return Heliocentric Galactic rectangular y-velocity (aka "V")
INPUT:
t - (optional) time at which to get U
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
V(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.V(*args, **kwargs)
def W(self, *args, **kwargs):
"""
NAME:
W
PURPOSE:
return Heliocentric Galactic rectangular z-velocity (aka "W")
INPUT:
t - (optional) time at which to get W
obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.])
OR Orbit object that corresponds to the orbit
of the observer
ro= distance in kpc corresponding to R=1. (default: 8.5)
vo= velocity in km/s corresponding to v=1. (default: 235.)
OUTPUT:
W(t)
HISTORY:
2011-02-24 - Written - Bovy (NYU)
"""
return self._orb.W(*args, **kwargs)
def __call__(self, *args, **kwargs):
"""
NAME:
__call__
PURPOSE:
return the orbit at time t
INPUT:
t - desired time
rect - if true, return rectangular coordinates
OUTPUT:
an Orbit instance with initial condition set to the
phase-space at time t or list of Orbit instances if multiple
times are given
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
thiso = self._orb(*args, **kwargs)
if len(thiso.shape) == 1: return Orbit(vxvv=thiso)
else: return [Orbit(vxvv=thiso[:, ii]) for ii in range(thiso.shape[1])]
def plot(self, *args, **kwargs):
"""
NAME:
plot
PURPOSE:
plot a previously calculated orbit (with reasonable defaults)
INPUT:
d1= first dimension to plot ('x', 'y', 'R', 'vR', 'vT', 'z', 'vz', ...)
d2= second dimension to plot
matplotlib.plot inputs+bovy_plot.plot inputs
OUTPUT:
sends plot to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plot(*args, **kwargs)
def plot3d(self, *args, **kwargs):
"""
NAME:
plot3d
PURPOSE:
plot 3D aspects of an Orbit
INPUT:
bovy_plot3d args and kwargs
OUTPUT:
plot
HISTORY:
2010-07-26 - Written - Bovy (NYU)
2010-09-22 - Adapted to more general framework - Bovy (NYU)
2010-01-08 - Adapted to 3D - Bovy (NYU)
"""
self._orb.plot3d(*args, **kwargs)
def plotE(self, *args, **kwargs):
"""
NAME:
plotE
PURPOSE:
plot E(.) along the orbit
INPUT:
pot= - Potential instance or list of instances in which the orbit
was integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R', 'vR', 'vT', 'vz'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotE(*args, **kwargs)
def plotEz(self, *args, **kwargs):
"""
NAME:
plotEz
PURPOSE:
plot E_z(.) along the orbit
INPUT:
po= - Potential instance or list of instances in which the orbit was
integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotEz(*args, **kwargs)
def plotEzJz(self, *args, **kwargs):
"""
NAME:
plotEzJzt
PURPOSE:
plot E_z(t)/sqrt(dens(R)) along the orbit
INPUT:
pot - Potential instance or list of instances in which the orbit was
integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-08-08 - Written - Bovy (NYU)
"""
self._orb.plotEzJz(*args, **kwargs)
def plotJacobi(self, *args, **kwargs):
"""
NAME:
plotJacobi
PURPOSE:
plot the Jacobi integral along the orbit
INPUT:
OmegaP= pattern speed
pot= - Potential instance or list of instances in which the orbit
was integrated
d1= - plot Ez vs d1: e.g., 't', 'z', 'R', 'vR', 'vT', 'vz'
+bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2011-10-10 - Written - Bovy (IAS)
"""
self._orb.plotJacobi(*args, **kwargs)
def plotR(self, *args, **kwargs):
"""
NAME:
plotR
PURPOSE:
plot R(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotR(*args, **kwargs)
def plotz(self, *args, **kwargs):
"""
NAME:
plotz
PURPOSE:
plot z(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotz(*args, **kwargs)
def plotvR(self, *args, **kwargs):
"""
NAME:
plotvR
PURPOSE:
plot vR(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotvR(*args, **kwargs)
def plotvT(self, *args, **kwargs):
"""
NAME:
plotvT
PURPOSE:
plot vT(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotvT(*args, **kwargs)
def plotphi(self, *args, **kwargs):
"""
NAME:
plotphi
PURPOSE:
plot \phi(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotphi(*args, **kwargs)
def plotvz(self, *args, **kwargs):
"""
NAME:
plotvz
PURPOSE:
plot vz(.) along the orbit
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-10 - Written - Bovy (NYU)
"""
self._orb.plotvz(*args, **kwargs)
def plotx(self, *args, **kwargs):
"""
NAME:
plotx
PURPOSE:
plot a one-dimensional orbit position
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.plotx(*args, **kwargs)
def plotvx(self, *args, **kwargs):
"""
NAME:
plotvx
PURPOSE:
plot a one-dimensional orbit velocity
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.plotvx(*args, **kwargs)
def ploty(self, *args, **kwargs):
"""
NAME:
ploty
PURPOSE:
plot a one-dimensional orbit position
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.ploty(*args, **kwargs)
def plotvy(self, *args, **kwargs):
"""
NAME:
plotvy
PURPOSE:
plot a one-dimensional orbit velocity
INPUT:
d1= plot vs d1: e.g., 't', 'z', 'R'
bovy_plot.bovy_plot inputs
OUTPUT:
figure to output device
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
self._orb.plotvy(*args, **kwargs)
def toPlanar(self):
"""
NAME:
toPlanar
PURPOSE:
convert a 3D orbit into a 2D orbit
INPUT:
(none)
OUTPUT:
planar Orbit
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
if len(self.vxvv) == 6:
vxvv = [self.vxvv[0], self.vxvv[1], self.vxvv[2], self.vxvv[5]]
elif len(self.vxvv) == 5:
vxvv = [self.vxvv[0], self.vxvv[1], self.vxvv[2]]
else:
raise AttributeError(
"planar or linear Orbits do not have the toPlanar attribute")
return Orbit(vxvv=vxvv)
def toLinear(self):
"""
NAME:
toLinear
PURPOSE:
convert a 3D orbit into a 1D orbit (z)
INPUT:
(none)
OUTPUT:
linear Orbit
HISTORY:
2010-11-30 - Written - Bovy (NYU)
"""
if len(self.vxvv) == 6 or len(self.vxvv) == 5:
vxvv = [self.vxvv[3], self.vxvv[4]]
else:
raise AttributeError(
"planar or linear Orbits do not have the toPlanar attribute")
return Orbit(vxvv=vxvv)
def __add__(self, linOrb):
"""
NAME:
__add__
PURPOSE:
add a linear orbit and a planar orbit to make a 3D orbit
INPUT:
linear or plane orbit instance
OUTPUT:
3D orbit
HISTORY:
2010-07-21 - Written - Bovy (NYU)
"""
if (not (isinstance(self._orb, planarROrbit)
and isinstance(linOrb._orb, linearOrbit))
and not (isinstance(self._orb, linearOrbit)
and isinstance(linOrb._orb, planarROrbit))):
raise AttributeError("Only planarROrbit+linearOrbit is supported")
if isinstance(self._orb, planarROrbit):
return Orbit(vxvv=[
self._orb.vxvv[0], self._orb.vxvv[1], self._orb.vxvv[2],
linOrb._orb.vxvv[0], linOrb._orb.vxvv[1]
])
else:
return Orbit(vxvv=[
linOrb._orb.vxvv[0], linOrb._orb.vxvv[1], linOrb._orb.vxvv[2],
self._orb.vxvv[0], self._orb.vxvv[1]
])
#4 pickling
def __getinitargs__(self):
return (self.vxvv, )
def __getstate__(self):
return self.vxvv
def __setstate__(self, state):
self.vxvv = state