def test_slalib(self, mjd, config):
from pyslalib import slalib
ra = numpy.zeros(len(mjd), 'float')
dec = numpy.zeros(len(mjd), 'float')
for i in range(len(mjd)):
# Calculate sun's (topocentric) position.
#ra_RAD, dec_RAD, diam = slalib.sla_rdplan(mjd[i], 0,
# config['longitude']*_deg2rad, config['latitude']*_deg2rad)
# Sun's (geocentric?) position.
bary_vel, bary_pos, helio_vel, helio_pos = slalib.sla_evp(
mjd, 2000)
sun_pos = -1 * (bary_pos)
ra_RAD, dec_RAD = slalib.sla_dcc2s(sun_pos)
ra[i] = ra_RAD * _rad2deg
dec[i] = dec_RAD * _rad2deg
print "Sun: Test_slalib results"
print " ... ra(slalib)"
print ra
print " ... ra(self)"
print self.ra
print self.ra.min(), self.ra.max()
print " ... dec(slalib)"
print dec
print " ... dec(self)"
print self.dec
def planet_J2000_geo_to_topo(self, gra, gdec, dist, radi, dut1, longitude, latitude, height):
jd_utc = self.calc_jd_utc()
date = jd_utc - 2400000.5 + dut1 / (24. * 3600.)
jd = jd_utc - 2400000.5 + (self.tai_utc + 32.184) / (24. * 3600.) # reference => http://www.cv.nrao.edu/~rfisher/Ephemerides/times.html
# Spherical to x,y,z
v = slalib.sla_dcs2c(gra, gdec)
for i in range (3):
v[i] *= dist
# Precession to date.
rmat = slalib.sla_prec(2000.0, slalib.sla_epj(jd))
vgp = slalib.sla_dmxv(rmat, v)
# Geocenter to observer (date).
stl = slalib.sla_gmst(date) + longitude
vgo = slalib.sla_pvobs(latitude, height, stl)
# Observer to planet (date).
for i in range (3):
v[i] = vgp[i] - vgo[i]
disttmp = dist
dist = math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])
radi *= disttmp / dist
# Precession to J2000
rmat = slalib.sla_prec(slalib.sla_epj(jd), 2000.)
vgp = slalib.sla_dmxv(rmat, v)
# To RA,Dec.
ret = slalib.sla_dcc2s(vgp)
tra = slalib.sla_dranrm(ret[0])
tdec = ret[1]
return [dist, radi, tra, tdec]
def calc_planet_coordJ2000(self, ntarg):
err_code = i = nctr = 3
c = 2.99792e8
k_to_au = 6.68459e-9
jd_utc = self.calc_jd_utc()
jd = jd_utc + (self.tai_utc + 32.184) / (24. * 3600.) # Convert UTC to Dynamical Time
if ntarg != 10:
if ntarg == 11: #for Sun
n_ntarg = 10
else:
n_ntarg = ntarg
position = self.jpl[0, n_ntarg].compute(jd) # compute planet Barycenter
position -= self.jpl[0, 3].compute(jd) # compute Earth Barycenter
position -= self.jpl[3, 399].compute(jd) # compute Earth position
dist = math.sqrt(position[0] ** 2 + position[1] ** 2 + position[2] ** 2) # [km]
position_1 = self.jpl[0, 3].compute(jd) #Earth position at jd
position_2 = self.jpl[0, n_ntarg].compute(jd - (dist / c) / (24. * 3600.)) # Target position when the light left
position = position_2 - position_1
position -= self.jpl[3, 399].compute(jd)
dist = math.sqrt(position[0] ** 2 + position[1] ** 2 + position[2] ** 2)
else: #for Moon
position = self.jpl[3, 301].compute(jd)
dist = math.sqrt(position[0] ** 2 + position[1] ** 2 + position[2] ** 2) # [km]
position = self.jpl[3,301].compute(jd - (dist / c) / (24 * 3600.0))
dist = math.sqrt(position[0] ** 2 + position[1] ** 2 + position[2] ** 2)
ret = slalib.sla_dcc2s(position)
ra = ret[0] # radian
dec = ret[1] # radian
ra = slalib.sla_dranrm(ra)
radi = math.asin(self.eqrau[ntarg] / dist)
dist = dist*k_to_au
return [ra, dec, dist, radi]
def HJD_to_JD(self, time_to_transform):
"""Transform the input time from HJD to JD.
:param array_like time_to_transform: the numpy array containing the time in HJD you want
to transform in JD.
:return: the time in JD
:rtype: array_like
"""
AU = self.AU
light_speed = self.speed_of_light
time_correction = []
# DTT=[]
for time in time_to_transform:
count = 0
jd = np.copy(time)
while count < 3:
Earth_position = slalib.sla_epv(jd)
Sun_position = -Earth_position[0]
Sun_angles = slalib.sla_dcc2s(Sun_position)
target_angles_in_the_sky = self.target_angles_in_the_sky
Time_correction = np.sqrt(
Sun_position[0] ** 2 + Sun_position[1] ** 2 + Sun_position[
2] ** 2) * AU / light_speed * (
np.sin(Sun_angles[1]) * np.sin(
target_angles_in_the_sky[1]) + np.cos(
Sun_angles[1]) * np.cos(
target_angles_in_the_sky[1]) * np.cos(
target_angles_in_the_sky[0] - Sun_angles[0])) / (
3600 * 24.0)
count = count + 1
# DTT.append(slalib.sla_dtt(jd)/(3600*24))
time_correction.append(Time_correction)
JD = time_to_transform + np.array(time_correction)
return JD
def HJD_to_JD(self, time_to_transform):
"""Transform the input time from HJD to JD.
:param array_like time_to_transform: the numpy array containing the time in HJD you want
to transform in JD.
:return: the time in JD
:rtype: array_like
"""
AU = self.AU
light_speed = self.speed_of_light
time_correction = []
# DTT=[]
for time in time_to_transform:
count = 0
jd = np.copy(time)
while count < 3:
Earth_position = slalib.sla_epv(jd)
Sun_position = -Earth_position[0]
Sun_angles = slalib.sla_dcc2s(Sun_position)
target_angles_in_the_sky = self.target_angles_in_the_sky
Time_correction = np.sqrt(
Sun_position[0] ** 2 + Sun_position[1] ** 2 + Sun_position[
2] ** 2) * AU / light_speed * (
np.sin(Sun_angles[1]) * np.sin(
target_angles_in_the_sky[1]) + np.cos(
Sun_angles[1]) * np.cos(
target_angles_in_the_sky[1]) * np.cos(
target_angles_in_the_sky[0] - Sun_angles[0])) / (
3600 * 24.0)
count = count + 1
# DTT.append(slalib.sla_dtt(jd)/(3600*24))
time_correction.append(Time_correction)
JD = time_to_transform + np.array(time_correction)
return JD
def calc_planet_coordJ2000(self, ntarg):
err_code = i = nctr = 3
c = 2.99792e8
k_to_au = 6.68459e-9
jd_utc = self.calc_jd_utc()
jd = jd_utc + (self.tai_utc + 32.184) / (
24. * 3600.) # Convert UTC to Dynamical Time
if ntarg != 10:
if ntarg == 11: #for Sun
n_ntarg = 10
else:
n_ntarg = ntarg
position = self.jpl[0, n_ntarg].compute(
jd) # compute planet Barycenter
position -= self.jpl[0, 3].compute(jd) # compute Earth Barycenter
position -= self.jpl[3, 399].compute(jd) # compute Earth position
dist = math.sqrt(position[0]**2 + position[1]**2 +
position[2]**2) # [km]
position_1 = self.jpl[0, 3].compute(jd) #Earth position at jd
position_2 = self.jpl[0, n_ntarg].compute(
jd - (dist / c) /
(24. * 3600.)) # Target position when the light left
position = position_2 - position_1
position -= self.jpl[3, 399].compute(jd)
dist = math.sqrt(position[0]**2 + position[1]**2 + position[2]**2)
else: #for Moon
position = self.jpl[3, 301].compute(jd)
dist = math.sqrt(position[0]**2 + position[1]**2 +
position[2]**2) # [km]
position = self.jpl[3,
301].compute(jd - (dist / c) / (24 * 3600.0))
dist = math.sqrt(position[0]**2 + position[1]**2 + position[2]**2)
ret = slalib.sla_dcc2s(position)
ra = ret[0] # radian
dec = ret[1] # radian
ra = slalib.sla_dranrm(ra)
radi = math.asin(self.eqrau[ntarg] / dist)
dist = dist * k_to_au
return [ra, dec, dist, radi]
def planet_J2000_geo_to_topo(self, gra, gdec, dist, radi, dut1, longitude,
latitude, height):
jd_utc = self.calc_jd_utc()
date = jd_utc - 2400000.5 + dut1 / (24. * 3600.)
jd = jd_utc - 2400000.5 + (self.tai_utc + 32.184) / (
24. * 3600.
) # reference => http://www.cv.nrao.edu/~rfisher/Ephemerides/times.html
# Spherical to x,y,z
v = slalib.sla_dcs2c(gra, gdec)
for i in range(3):
v[i] *= dist
# Precession to date.
rmat = slalib.sla_prec(2000.0, slalib.sla_epj(jd))
vgp = slalib.sla_dmxv(rmat, v)
# Geocenter to observer (date).
stl = slalib.sla_gmst(date) + longitude
vgo = slalib.sla_pvobs(latitude, height, stl)
# Observer to planet (date).
for i in range(3):
v[i] = vgp[i] - vgo[i]
disttmp = dist
dist = math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])
radi *= disttmp / dist
# Precession to J2000
rmat = slalib.sla_prec(slalib.sla_epj(jd), 2000.)
vgp = slalib.sla_dmxv(rmat, v)
# To RA,Dec.
ret = slalib.sla_dcc2s(vgp)
tra = slalib.sla_dranrm(ret[0])
tdec = ret[1]
return [dist, radi, tra, tdec]
def test_slalib(self, mjd, config):
from pyslalib import slalib
ra = numpy.zeros(len(mjd), 'float')
dec = numpy.zeros(len(mjd), 'float')
for i in range(len(mjd)):
# Calculate sun's (topocentric) position.
#ra_RAD, dec_RAD, diam = slalib.sla_rdplan(mjd[i], 0,
# config['longitude']*_deg2rad, config['latitude']*_deg2rad)
# Sun's (geocentric?) position.
bary_vel, bary_pos, helio_vel, helio_pos = slalib.sla_evp(mjd, 2000)
sun_pos = -1 * (bary_pos)
ra_RAD, dec_RAD = slalib.sla_dcc2s(sun_pos)
ra[i] = ra_RAD * _rad2deg
dec[i] = dec_RAD * _rad2deg
print "Sun: Test_slalib results"
print " ... ra(slalib)"
print ra
print " ... ra(self)"
print self.ra
print self.ra.min(), self.ra.max()
print " ... dec(slalib)"
print dec
print " ... dec(self)"
print self.dec