def galactic(self, timestamp=None, antenna=None):
"""Calculate target's galactic (l, b) coordinates as seen from antenna at time(s).
This calculates the galactic coordinates of the target, based on the
J2000 *astrometric* equatorial coordinates. This is its position relative
to the Galactic reference frame for the epoch of J2000.
Parameters
----------
timestamp : :class:`Timestamp` object or equivalent, or sequence, optional
Timestamp(s) in UTC seconds since Unix epoch (defaults to now)
antenna : :class:`Antenna` object, optional
Antenna which points at target (defaults to default antenna)
Returns
-------
l : :class:`ephem.Angle` object, or array of same shape as *timestamp*
Galactic longitude, in radians
b : :class:`ephem.Angle` object, or array of same shape as *timestamp*
Galactic latitude, in radians
Raises
------
ValueError
If no antenna is specified, and no default antenna was set either
"""
if self.body_type == 'gal':
l, b = ephem.Galactic(
ephem.Equatorial(self.body._ra, self.body._dec)).get()
if is_iterable(timestamp):
return np.tile(l, len(timestamp)), np.tile(b, len(timestamp))
else:
return l, b
ra, dec = self.astrometric_radec(timestamp, antenna)
if is_iterable(ra):
lb = np.array([
ephem.Galactic(ephem.Equatorial(ra[n], dec[n])).get()
for n in xrange(len(ra))
])
return lb[:, 0], lb[:, 1]
else:
return ephem.Galactic(ephem.Equatorial(ra, dec)).get()
def azel2radec(self):
"""
Compute the ra,dec (J2000) from Az,El location and time
"""
if ephemOK:
location = ephem.Observer()
location.lon = str(self.tellon)
location.lat = str(self.tellat)
location.elevation = self.telelev
strnow = self.utc.isoformat()
# convert Time string format into value for Observer
dates = strnow.split('T')
datestr = dates[0] + ' ' + dates[1]
if ephemOK:
location.date = datestr
# compute Local Sidereal Time
lst = location.sidereal_time()
aparts = angles.phmsdms(str(lst))
self.lst = angles.sexa2deci(aparts['sign'],
*aparts['vals'],
todeg=True)
## Must set the date before calculating ra, dec!!!
# compute apparent RA,DEC for date of observations
ra_a, dec_a = location.radec_of(str(self.telaz), str(self.telel))
radec = ephem.Equatorial(ra_a, dec_a, epoch=datestr)
radec2000 = ephem.Equatorial(radec, epoch=ephem.J2000)
# Hours
aparts = angles.phmsdms(str(radec2000.ra))
self.ra = angles.sexa2deci(aparts['sign'],
*aparts['vals'],
todeg=True)
# to convert to dec degrees need to replace on : with d
aparts = angles.phmsdms(str(radec2000.dec))
self.dec = angles.sexa2deci(aparts['sign'], *aparts['vals'])
self.epoch = "2000"
# now update galactic coordinates
if ephemOK:
self.radec2gal()
sun = ephem.Sun(location)
aparts = angles.phmsdms(str(sun.az))
self.az_sun = angles.sexa2deci(aparts['sign'], *aparts['vals'])
aparts = angles.phmsdms(str(sun.alt))
self.altsun = angles.sexa2deci(aparts['sign'], *aparts['vals'])
def to_fits(ftag,i,src,cnt):
filename = fname(ftag,cnt)
print 'Saving data to', filename
while len(i.shape) < 4: i.shape = i.shape + (1,)
cen = ephem.Equatorial(src.ra, src.dec, epoch=aa.epoch)
# We precess the coordinates of the center of the image here to
# J2000, just to have a well-defined epoch for them. For image coords to
# be accurately reconstructed, precession needs to be applied per pixel
# and not just per phase-center because ra/dec axes aren't necessarily
# aligned between epochs. When reading these images, to be 100% accurate,
# one should precess the ra/dec coordinates back to the date of the
# observation, infer the coordinates of all the pixels, and then
# precess the coordinates for each pixel independently.
cen = ephem.Equatorial(cen, epoch=ephem.J2000)
a.img.to_fits(filename, i, clobber=True,
object=src.src_name, obs_date=str(aa.date),
ra=cen.ra*a.img.rad2deg, dec=cen.dec*a.img.rad2deg, epoch=2000.,
d_ra=L[-1,-1]*a.img.rad2deg, d_dec=M[1,1]*a.img.rad2deg,
freq=n.average(aa[0].beam.afreqs))
def test_swift_grb_v2_fk5(self):
with open(datapaths.swift_bat_grb_pos_v2) as f:
swift_grb_v2 = voeventparse.load(f)
known_swift_grb_posn = ephem.Equatorial(74.741200 / DEG_PER_RADIAN,
25.313700 / DEG_PER_RADIAN,
epoch=ephem.J2000)
voe_coords = voeventparse.pull_astro_coords(swift_grb_v2)
extracted_posn = convert_voe_coords_to_eqposn(voe_coords)
self.assertEqual(extracted_posn.ra, known_swift_grb_posn.ra)
self.assertEqual(extracted_posn.dec, known_swift_grb_posn.dec)
def ecliptic(ra, dec):
"""ecliptic.
Args:
ra:
dec:
"""
np = ephem.Equatorial(math.radians(ra), math.radians(dec), epoch='2000')
e = ephem.Ecliptic(np)
return (math.degrees(e.lon), math.degrees(e.lat))
def transform_celestial(coords, systems):
lons, lats = np.radians(coords['lon']), np.radians(coords['lat'])
out = Table()
out['lon'] = np.zeros(len(coords), dtype='float64')
out['lat'] = np.zeros(len(coords), dtype='float64')
for ii, (lon, lat) in enumerate(zip(lons, lats)):
# Create coordinate in input system
if systems['in'] == 'fk5':
coord = ephem.Equatorial(lon, lat)
elif systems['in'] == 'fk4':
coord = ephem.Equatorial(lon, lat, epoch=ephem.B1950)
elif systems['in'] == 'galactic':
coord = ephem.Galactic(lon, lat)
elif systems['in'] == 'ecliptic':
coord = ephem.Ecliptic(lon, lat)
else:
raise ValueError()
# Convert to appropriate output system
# Retrieving output system coordinates is system specific
# because the attribute names depend on the system
if systems['out'] == 'fk5':
coord = ephem.Equatorial(coord, epoch=ephem.J2000)
lon, lat = coord.ra, coord.dec
elif systems['out'] == 'fk4':
coord = ephem.Equatorial(coord, epoch=ephem.B1950)
lon, lat = coord.ra, coord.dec
elif systems['out'] == 'galactic':
coord = ephem.Galactic(coord)
lon, lat = coord.lon, coord.lat
elif systems['out'] == 'ecliptic':
coord = ephem.Ecliptic(coord)
lon, lat = coord.lon, coord.lat
else:
raise ValueError()
out[ii]['lon'] = np.degrees(lon)
out[ii]['lat'] = np.degrees(lat)
return out
def ecliptic_to_J2000(elong, elat, mjd):
"""
convert from ephem.Ecliptic coordinates to RA and dec
"""
t = Time(mjd, format='mjd')
# t is probably needed for convert from current to J2000
eq = Ecliptic(str(elong), str(elat), epoch=2000)
ra, dec = ephem.Equatorial(eq).to_radec()
#print "Astronomy:",type(ra),type(dec)
#print "Astronomy:", type(ra.real), type(dec.real)
return ra.real, dec.real
def ecliptic_lon(now_time: datetime.datetime) -> float:
"""
根据日期计算黄经
now_time -- 日期
Return arguments:
float -- 黄经
"""
s = ephem.Sun(now_time)
equ = ephem.Equatorial(s.ra, s.dec, epoch=now_time)
e = ephem.Ecliptic(equ)
return e.lon
def precess(self, epoch=Epoch.NOW):
if str(epoch).lower() == str(Epoch.J2000).lower():
epoch = ephem.J2000
elif str(epoch).lower() == str(Epoch.B1950).lower():
epoch = ephem.B1950
elif str(epoch).lower() == str(Epoch.NOW).lower():
epoch = ephem.now()
j2000 = self.toEphem()
now = ephem.Equatorial(j2000, epoch=epoch)
return Position.fromRaDec(Coord.fromR(now.ra), Coord.fromR(now.dec), epoch=Epoch.NOW)
def plot_ecliptic_plane(handles, labels):
ep = [ephem.Ecliptic(str(lon), str(0)) for lon in range(0, 360)
] # this line is fine: need Ecliptic(long, lat) format in creation
ecPlane = [ephem.Equatorial(coord)
for coord in ep] # so this must be where the issue is.
ra_ecPlane = [math.degrees(coord.ra) for coord in ecPlane]
dec_ecPlane = [math.degrees(coord.dec) for coord in ecPlane]
handles.append(plt.plot(ra_ecPlane, dec_ecPlane, '#E47833'))
labels.append('ecliptic')
# plt.plot([rr+360 for rr in ra_ecPlane], dec_ecPlane, '#E47833') # echo
return handles, labels
def __init__(self, source_name):
# Check if the source is in the catalogue.
if not source_name in catalogue.keys():
raise ValueError("Source not in catalogue see "
"(`source.catalogue`).")
self.source_name = source_name
cat_info = catalogue[source_name]
# Convert souce location to degrees.
Loc = ephem.Equatorial(cat_info['RA'], cat_info['DEC'])
RA, DEC = Loc.get()
self.RA = RA * 180 / np.pi
self.DEC = DEC * 180 / np.pi
def parse_patch_center_and_width(args, parts):
""" Parse center-and-width patch definition
"""
corners = []
print('Center-and-width format ', end='')
try:
# Assume coordinates in degrees
lon = float(parts[2]) * degree
lat = float(parts[3]) * degree
except:
# Failed simple interpreration, assume pyEphem strings
lon = parts[2]
lat = parts[3]
width = float(parts[4]) * degree
if args.patch_coord == 'C':
center = ephem.Equatorial(lon, lat, epoch='2000')
elif args.patch_coord == 'E':
center = ephem.Ecliptic(lon, lat, epoch='2000')
elif args.patch_coord == 'G':
center = ephem.Galactic(lon, lat, epoch='2000')
else:
raise RuntimeError('Unknown coordinate system: {}'.format(
args.patch_coord))
center = ephem.Equatorial(center)
# Synthesize 8 corners around the center
phi = center.ra
theta = center.dec
r = width / 2
ncorner = 8
angstep = 2 * np.pi / ncorner
for icorner in range(ncorner):
ang = angstep * icorner
delta_theta = np.cos(ang) * r
delta_phi = np.sin(ang) * r / np.cos(theta + delta_theta)
patch_corner = ephem.FixedBody()
patch_corner._ra = phi + delta_phi
patch_corner._dec = theta + delta_theta
corners.append(patch_corner)
return corners
def createEclipticPath(self):
eline = []
for i in range(361):
l = str(0 + i)
b = ephem.Ecliptic(l, "0", epoch="2016")
c = ephem.Equatorial(b)
r = c.ra
d = c.dec
rr = float(r) / (2.0 * math.pi) * 24
dd = float(d) * 180. / math.pi
eline.append([rr, dd])
return eline
def testprecession(self):
"""Test coordinate precessions for accuracy"""
crdpairs = [[('0:00', '0:00'), ('00:02:33.77', '00:16:42.1')],
[('6:00', '0:00'), ('06:02:33.75', '-00:00:05.6')],
[('0:00', '89:00'), ('00:03:03.75', '+89:16:41.7')]]
for b1950, j2000 in crdpairs:
c1 = a.coord.convert(b1950,
'eq',
'eq',
iepoch=e.B1950,
oepoch=e.J2000)
c2 = a.coord.convert(j2000,
'eq',
'eq',
iepoch=e.J2000,
oepoch=e.B1950)
c1_ck = e.Equatorial(j2000[0], j2000[1], epoch=e.J2000).get()
c2_ck = e.Equatorial(b1950[0], b1950[1], epoch=e.B1950).get()
self.assertAlmostEqual(c1[0], c1_ck[0], 4)
self.assertAlmostEqual(c1[1], c1_ck[1], 4)
self.assertAlmostEqual(c2[0], c2_ck[0], 4)
self.assertAlmostEqual(c2[1], c2_ck[1], 4)
def radec2gal(self):
"""
Compute the ra,dec (J2000) from Az,El location and time
"""
rads = np.pi / 180.
radec2000 = ephem.Equatorial( rads*self.ra, rads*self.dec, epoch=ephem.J2000)
# to convert to dec degrees need to replace on : with d
self.epoch = "2000"
gal = ephem.Galactic(radec2000)
aparts = angles.phmsdms(str(gal.lon))
self.gallon = angles.sexa2deci(aparts['sign'], *aparts['vals'])
aparts = angles.phmsdms(str(gal.lat))
self.gallat = angles.sexa2deci(aparts['sign'], *aparts['vals'])
def __init__(self, parfile, timfile):
# initialize libstempo object
t2psr = t2.tempopulsar(
parfile,
timfile,
maxobs=30000,
)
# get attributes
self.name = t2psr.name
self.residuals = np.double(t2psr.residuals())
self.toas = np.double(t2psr.toas() * 86400)
self.toaerrs = np.double(t2psr.toaerrs * 1e-6)
self.flags = t2psr.flagvals('f')
Mmat = np.double(t2psr.designmatrix())
# sort
self.isort, self.iisort = utils.argsortTOAs(self.toas,
self.flags,
which='jitterext',
dt=1.0)
self.toas = self.toas[self.isort]
self.toaerrs = self.toaerrs[self.isort]
self.residuals = self.residuals[self.isort]
self.flags = self.flags[self.isort]
Mmat = Mmat[self.isort, :]
u, s, v = np.linalg.svd(Mmat, full_matrices=False)
self.Musvd = u
self.Mssvd = s
# get sky location
pars = t2psr.pars()
if 'RAJ' not in pars and 'DECJ' not in pars:
elong, elat = t2psr['ELONG'].val, t2psr['ELAT'].val
ec = ephem.Ecliptic(elong, elat)
# check for B name
if 'B' in t2psr.name:
epoch = '1950'
else:
epoch = '2000'
eq = ephem.Equatorial(ec, epoch=epoch)
self.phi = np.double([eq.ra])
self.theta = np.pi / 2 - np.double([eq.dec])
else:
self.phi = np.double(t2psr['RAJ'].val)
self.theta = np.pi / 2 - np.double(t2psr['DECJ'].val)
def calcazel(ra, dec, longitude=-79.8397, latitude=38.4331, elevation=800.):
"""
Compute the ra,dec (J2000) from Az,El location and time
"""
location = ephem.Observer()
location.lon = angles.d2r(longitude)
location.lat = angles.d2r(latitude)
location.elevation = elevation
now = datetime.datetime.utcnow()
strnow = now.isoformat()
dates = strnow.split('T')
datestr = dates[0] + ' ' + dates[1]
location.date = datestr
lst = location.sidereal_time()
fmt = 'Date = %s, LST = %s'
print fmt % (datestr, lst)
# first put ra,dec in ephemeris format
radec2000 = ephem.Equatorial( ra, dec, epoch=ephem.J2000)
# now compute ra, dec of date
radec = ephem.Equatorial(radec2000.ra, radec2000.dec, epoch=datestr)
print 'Ra,Dec = %s, %s (J2000)' % (radec2000.ra, radec2000.dec)
gal = ephem.Galactic(radec2000)
print 'Lon,Lat= %s, %s (Galactic)' % (gal.lon, gal.lat)
object = ephem.FixedBody()
object._ra = radec.ra
object._dec = radec.dec
object.compute(location)
# need to turn dd:mm:ss into float
aparts = angles.phmsdms(str(object.az))
az = angles.sexa2deci(aparts['sign'], *aparts['vals'], todeg=False)
aparts = angles.phmsdms(str(object.alt))
el = angles.sexa2deci(aparts['sign'], *aparts['vals'], todeg=False)
# print "Az: %s -> %f" % (str(object.az), az)
# print "El: %s -> %f" % (str(object.alt), el)
fmt = 'Az, El = %.2f, %.2f (degrees)'
print fmt % (az, el)
return az, el
def ecliptic_lat_span(self, blockID):
junk, fieldIds = self.fields_in_block(blockID)
ecs = []
for field in fieldIds:
rr = ephem.Equatorial(ephem.hours(self.bk.field_ra(field)),
ephem.degrees(self.bk.field_dec(field)))
ec = ephem.Ecliptic(rr)
ecs.append(ec)
ecs.sort(key=lambda x: x.__getattribute__('lat'))
retval = (degrees(ecs[0].lat), degrees(ecs[-1].lat)
) # eclat is float (deg), min-max
return retval
def plot_galactic_plane(handles, labels):
gp = [ephem.Galactic(str(lon), str(0)) for lon in range(0, 360)]
galPlane = [ephem.Equatorial(coord) for coord in gp]
# rewrap the ra to start at zero: that otherwise causes a problem in the plotting!
temp = [(math.degrees(coord.ra), math.degrees(coord.dec))
for coord in galPlane]
temp.sort(key=lambda x: x[0])
ra_galPlane = [t[0] for t in temp]
dec_galPlane = [tt[1] for tt in temp]
handles.append(plt.plot(ra_galPlane, dec_galPlane, 'b'))
labels.append('galactic plane')
# plt.plot([r+360 for r in ra_galPlane], dec_galPlane, 'b') # echo
return handles, labels
def convertMapToJ2000(map):
"""
Given a map in Equatorial coodinates in the B1950 epoch, convert it to
the J2000 epoch.
"""
hasMask = False
if getattr(map, 'mask', None) is not None:
hasMask = True
map2 = map * 0.0
nSides = hp.pixelfunc.npix2nside(map.size)
for i in xrange(map.size):
theta, phi = hp.pixelfunc.pix2ang(nSides, i)
eq = ephem.Equatorial(phi, np.pi / 2 - theta, epoch=ephem.B1950)
eq = ephem.Equatorial(eq, epoch=ephem.J2000)
j = hp.pixelfunc.ang2pix(nSides, np.pi / 2 - eq.dec, eq.ra)
map2[j] += map[i]
if hasMask:
map2.mask[j] = map.mask[i]
return map2
def gal_index(ra, dec):
p = ephem.Equatorial(str(ra), str(dec))
galactic = ephem.Galactic(p)
glong = math.degrees(galactic.lon)
glat = math.degrees(galactic.lat)
glndx = int(glong) + 180
glndx %= 360
glndx /= args.increment
glndx -= 1
gladx = int(glat) + 90
gladx /= args.increment
gladx -= 1
return ((glndx, gladx))
def radec_decimal(ra, dec):
a = ephem.Equatorial(0.0, 0.0)
if (hasattr(ra, "__len__") == False):
a.from_radec(ra, dec)
temp = np.degrees(a.to_radec())
return [temp[0], temp[1]]
else:
rao = np.zeros(len(ra), dtype='float64')
deco = np.zeros(len(ra), dtype='float64')
for i in range(len(ra)):
a.from_radec(ra[i], dec[i])
temp = np.degrees(a.to_radec())
rao[i] = temp[0]
deco[i] = temp[1]
return rao, deco
def parse_patch_explicit(args, parts):
""" Parse an explicit patch definition line
"""
corners = []
print('Explicit-corners format ', end='')
while i < len(parts):
print(' ({}, {})'.format(parts[2], parts[3]), end='')
try:
# Assume coordinates in degrees
lon = float(parts[2]) * degree
lat = float(parts[3]) * degree
except:
# Failed simple interpreration, assume pyEphem strings
lon = parts[2]
lat = parts[3]
i += 2
if args.patch_coord == 'C':
corner = ephem.Equatorial(lon, lat, epoch='2000')
elif args.patch_coord == 'E':
corner = ephem.Ecliptic(lon, lat, epoch='2000')
elif args.patch_coord == 'G':
corner = ephem.Galactic(lon, lat, epoch='2000')
else:
raise RuntimeError('Unknown coordinate system: {}'.format(
args.patch_coord))
corner = ephem.Equatorial(corner)
if corner.dec > 80 * degree or corner.dec < -80 * degree:
raise RuntimeError(
'{} has at least one circumpolar corner. '
'Circumpolar targeting not yet implemented'.format(name))
patch_corner = ephem.FixedBody()
patch_corner._ra = corner.ra
patch_corner._dec = corner.dec
corners.append(patch_corner)
return corners
def _run(self, simData):
for i in np.arange(simData.size):
coord = ephem.Equatorial(simData[self.raCol][i],
simData[self.decCol][i],
epoch=2000)
ecl = ephem.Ecliptic(coord)
simData['eclipLat'][i] = ecl.lat
if self.subtractSunLon:
djd = mjd2djd(simData[self.mjdCol][i])
sun = ephem.Sun(djd)
sunEcl = ephem.Ecliptic(sun)
lon = wrapRA(ecl.lon - sunEcl.lon)
simData['eclipLon'][i] = lon
else:
simData['eclipLon'][i] = ecl.lon
return simData
def shift_to_vlsr_frame(self):
# From http://web.mit.edu/8.13/www/nsrt_software/documentation/vlsr.pdf
ep_target = ephem.Equatorial(self.target)
# Sun velocity apex is at 18 hr, 30 deg; convert to x, y, z
# geocentric celestial for dot product with source, multiply by speed
x0 = 20.0 * math.cos(18.0 * np.pi / 12.0) * math.cos(
30.0 * np.pi / 180.0)
y0 = 20.0 * math.sin(18.0 * np.pi / 12.0) * math.cos(
30.0 * np.pi / 180.0)
z0 = 20.0 * math.sin(30.0 * np.pi / 180.0)
# Make sure we have target angles in radians
tg_ra_rad = float(ep_target.ra)
tg_dec_rad = float(ep_target.dec)
# Calculate sinces, cosines for dot product
ctra = math.cos(tg_ra_rad)
stra = math.sin(tg_ra_rad)
ctdc = math.cos(tg_dec_rad)
stdc = math.sin(tg_dec_rad)
# Calculate correction due to movement of Sun with respect to LSR
# dot product of target & apex vectors
vsun = x0 * ctra * ctdc + y0 * stra * ctdc + z0 * stdc
# get target in geocentric ecliptic system
ecl = ephem.Ecliptic(ep_target)
tlon = ecl.lon
tlat = ecl.lat
# Get sun ecliptic coordinates, in radians
sun = ephem.Sun()
sun.compute(self.site)
se = ephem.Ecliptic(sun)
slong = float(se.lon)
# Calculate correction due to earth movement relative to the Sun
vorb = 30.0 * math.cos(tlat) * math.sin(slong - tlon)
# Combine both effects
vlsr_kmps = vsun + vorb # in km/s
vlsr_corr = 1e3 * vlsr_kmps # in m/s
self.vlsr_corr = vlsr_corr # store for this spectrum
# Convert and store shift also for frequency
self.freq_vlsr_corr = -1 * self.rest_freq * self.vlsr_corr / c
def gc2azalt(gl,gb,ct3):
global convert
body_gl=gl*convert
body_gb=gb*convert
galactic_coord = ephem.Galactic(body_gl, body_gb)
eq = ephem.Equatorial(galactic_coord)
getlocal = ephem.Observer()
getlocal.long, getlocal.lat = '116.97345','40.55666' # at Miyun
getlocal.date = ct3 # UT
body = ephem.FixedBody()
body._ra = eq.ra
body._dec = eq.dec
body._epoch = ephem.J2000
body.compute(getlocal)
return float(body.az)*180/np.pi,float(body.alt)*180/np.pi
def compute_libration(self):
"""
Compute topocentric libration angles and the position angle of the moon's rotational axis.
:return: -
"""
# Astrometric libration angles and the selenographic co-longitude of the sun are provided
# by PyEphem.
self.astrometric_lib_lat = self.moon.libration_lat
self.astrometric_lib_long = self.moon.libration_long
self.colong = self.moon.colong
# Compute topocentric libration values. For algorithmic details, refer to the user's guide.
j2000 = ephem.Date(datetime.datetime(2000, 1, 1, 12, 0))
t = (ephem.Date(self.location_time.date) - j2000) / 36525.
epsilon = radians(23.439281 - 0.013002575 * t)
ma = ephem.Equatorial(self.ra,
self.de,
epoch=ephem.Date(self.location_time.date))
me = ephem.Ecliptic(ma)
cap_i = radians(1.54266)
omega = radians(125.044555 - 1934.13626194 * t)
lm = radians(218.31664563 + 481267.88119575 * t - 0.00146638 * t**2)
i = acos(
cos(cap_i) * cos(epsilon) + sin(cap_i) * sin(epsilon) * cos(omega))
omega_prime = atan2(-sin(cap_i) * sin(omega) / sin(i),
(cos(cap_i) * sin(epsilon) -
sin(cap_i) * cos(epsilon) * cos(omega)) / sin(i))
self.pos_rot_north = atan2(
-sin(i) * cos(omega_prime - self.ra),
cos(self.de) * cos(i) -
sin(self.de) * sin(i) * sin(omega_prime - self.ra))
self.topocentric_lib_lat = asin(-sin(cap_i) * cos(me.lat) *
sin(me.lon - omega) -
cos(cap_i) * sin(me.lat))
self.topocentric_lib_long = (atan2(
cos(cap_i) * cos(me.lat) * sin(me.lon - omega) -
sin(cap_i) * sin(me.lat),
cos(me.lat) * cos(me.lon - omega)) - lm + omega) % (2. * pi)
if self.topocentric_lib_long > 1.:
self.topocentric_lib_long -= 2. * pi
elif self.topocentric_lib_long < -1.:
self.topocentric_lib_long += 2. * pi
def add_fields():
fields_to_plot = ascii.read("fields_to_plot.txt")
for i in range(len(fields_to_plot["RA"])):
eq = ephem.Equatorial(fields_to_plot["RA"][i] / degrad,
fields_to_plot["Dec"][i] / degrad,
epoch=2000)
ec = ephem.Ecliptic(eq, epoch=2000)
if abs(float(ec.lat) * degrad) >= 54:
pltcolor = 'g'
else:
pltcolor = 'r'
add_point(fields_to_plot["RA"][i] / degrad,
fields_to_plot["Dec"][i] / degrad,
color=pltcolor,
txtlabel=fields_to_plot["Field"][i])
def block_table_pprint():
"""
:return:
"""
with open('block_table.tex', 'w') as outfile:
for name, coords in parameters.BLOCKS.items():
print name, coords
ra = ephem.hours(coords['RA'])
dec = ephem.degrees(coords['DEC'])
eq = ephem.Equatorial(ra, dec)
ec = ephem.Ecliptic(eq)
outfile.write(
"{} & {:2.1f} & {:2.1f} & {:2.1f} & {:2.1f} {} \n".format(
name[2:], math.degrees(ephem.degrees(ra)),
math.degrees(dec), math.degrees(ec.lat),
math.degrees(ec.lon), r"\\"))
return
def p(self, lon, lat):
if 0 == 1:
g = ephem.Galactic(ephem.Equatorial(lon * pi / 180.,
lat * pi / 180.,
epoch=ephem.J2000),
epoch=ephem.J2000)
lon = g.long * 180 / pi
lat = g.lat * 180 / pi
#print lon,lat
try:
x, y = pyproj.transform(self.prj_ra_dec, self.prj, lon, lat)
except:
return (-999999, -999999)
x = -x * self.paperwidth / self.xfactor + self.paperwidth / 2
y = y * self.paperheight / self.yfactor + self.paperheight / 2
# x=x*self.paperwidth/self.scale+self.paperwidth/2
# y=y*self.paperwidth/self.scale+self.paperheight/2
return x, y