def test_oo_transform():
""" test oo_transform method"""
try:
import pyoorb
except ImportError:
return None
orbit = Orbit.from_horizons('Ceres')
cart_orbit = orbit.oo_transform('CART')
kep_orbit = cart_orbit.oo_transform('KEP')
u.isclose(orbit['a'][0], kep_orbit['a'][0])
u.isclose(orbit['e'][0], kep_orbit['e'][0])
u.isclose(orbit['i'][0], kep_orbit['i'][0])
u.isclose(orbit['Omega'][0], kep_orbit['Omega'][0])
u.isclose(orbit['w'][0], kep_orbit['w'][0])
u.isclose(orbit['M'][0], kep_orbit['M'][0])
u.isclose(orbit['epoch'][0], kep_orbit['epoch'][0])
com_orbit = orbit.oo_transform('COM')
kep_orbit = com_orbit.oo_transform('KEP')
u.isclose(orbit['a'][0], kep_orbit['a'][0])
u.isclose(orbit['e'][0], kep_orbit['e'][0])
u.isclose(orbit['i'][0], kep_orbit['i'][0])
u.isclose(orbit['Omega'][0], kep_orbit['Omega'][0])
u.isclose(orbit['w'][0], kep_orbit['w'][0])
u.isclose(orbit['M'][0], kep_orbit['M'][0])
u.isclose(orbit['epoch'][0], kep_orbit['epoch'][0])
def test_from_oo():
"""test from_oo method"""
try:
import pyoorb
except ImportError:
return None
orbit = Orbit.from_horizons('Ceres')
horizons_ephem = Ephem.from_horizons('Ceres', location='500')
oo_ephem = Ephem.from_oo(orbit)
u.isclose(horizons_ephem['ra'][0], oo_ephem['ra'][0])
u.isclose(horizons_ephem['dec'][0], oo_ephem['dec'][0])
u.isclose(horizons_ephem['RA*cos(Dec)_rate'][0],
oo_ephem['RA*cos(Dec)_rate'][0])
u.isclose(horizons_ephem['dec_rate'][0], oo_ephem['dec_rate'][0])
u.isclose(horizons_ephem['alpha'][0], oo_ephem['alpha'][0])
u.isclose(horizons_ephem['r'][0], oo_ephem['r'][0])
u.isclose(horizons_ephem['delta'][0], oo_ephem['delta'][0])
u.isclose(horizons_ephem['V'][0], oo_ephem['V'][0])
u.isclose(horizons_ephem['hlon'][0], oo_ephem['hlon'][0])
u.isclose(horizons_ephem['hlat'][0], oo_ephem['hlat'][0])
u.isclose(horizons_ephem['EL'][0], oo_ephem['EL'][0])
# test manual orbit definition lacking units
manorbit = Orbit.from_dict({
'targetname': orbit['targetname'][0],
'a': orbit['a'].value[0],
'e': orbit['e'][0],
'i': orbit['i'].value[0],
'w': orbit['w'].value[0],
'Omega': orbit['Omega'].value[0],
'datetime_jd': orbit['datetime_jd'][0].value,
'M': orbit['M'].value[0],
'H': orbit['H'].value[0],
'G': orbit['G'][0],
'timescale': orbit['timescale'][0]
})
oo_ephem = Ephem.from_oo(manorbit)
u.isclose(horizons_ephem['ra'][0], oo_ephem['ra'][0])
u.isclose(horizons_ephem['dec'][0], oo_ephem['dec'][0])
u.isclose(horizons_ephem['RA*cos(Dec)_rate'][0],
oo_ephem['RA*cos(Dec)_rate'][0])
u.isclose(horizons_ephem['dec_rate'][0], oo_ephem['dec_rate'][0])
u.isclose(horizons_ephem['alpha'][0], oo_ephem['alpha'][0])
u.isclose(horizons_ephem['r'][0], oo_ephem['r'][0])
u.isclose(horizons_ephem['delta'][0], oo_ephem['delta'][0])
u.isclose(horizons_ephem['V'][0], oo_ephem['V'][0])
u.isclose(horizons_ephem['hlon'][0], oo_ephem['hlon'][0])
u.isclose(horizons_ephem['hlat'][0], oo_ephem['hlat'][0])
u.isclose(horizons_ephem['EL'][0], oo_ephem['EL'][0])
def test_oo_propagate():
""" test oo_propagate method"""
try:
import pyoorb
except ImportError:
return None
orbit = Orbit.from_horizons('Ceres')
epoch = Time.now().jd + 100
future_orbit = Orbit.from_horizons('Ceres', epochs=epoch)
oo_orbit = orbit.oo_propagate(epoch)
u.isclose(oo_orbit['a'][0], future_orbit['a'][0])
u.isclose(oo_orbit['e'][0], future_orbit['e'][0])
u.isclose(oo_orbit['i'][0], future_orbit['i'][0])
u.isclose(oo_orbit['Omega'][0], future_orbit['Omega'][0])
u.isclose(oo_orbit['w'][0], future_orbit['w'][0])
u.isclose(oo_orbit['M'][0], future_orbit['M'][0])
u.isclose(oo_orbit['epoch'][0], future_orbit['epoch'][0])
def test_from_horizons():
""" test from_horizons method"""
# current epoch
now = Time.now()
data = Orbit.from_horizons('Ceres')
assert_allclose(data['datetime_jd'], now.jd*u.d)
# date range - astropy.time.Time objects
epochs = {'start': Time('2018-01-02', format='iso'),
'stop': Time('2018-01-05', format='iso'),
'step': '6h'}
data = Orbit.from_horizons('Ceres', epochs=epochs)
assert len(data.table) == 13
# date range - strings
epochs = {'start': '2018-01-02',
'stop': '2018-01-05',
'step': '6h'}
data = Orbit.from_horizons('Ceres', epochs=epochs)
assert len(data.table) == 13
# discrete epochs - astropy.time.Time objects
epochs = [Time('2018-01-02', format='iso'),
Time('2018-01-05', format='iso')]
data = Orbit.from_horizons('Ceres', epochs=epochs)
assert len(data.table) == 2
# discrete epochs - Julian Dates
epochs = [Time('2018-01-02', format='iso').jd,
Time('2018-01-05', format='iso').jd]
data = Orbit.from_horizons('Ceres', epochs=epochs)
assert len(data.table) == 2
# query two objects
data = Orbit.from_horizons(['Ceres', 'Pallas'])
assert len(data.table) == 2
# test bib service
with bib.Tracking():
data = Orbit.from_horizons(['Ceres', 'Pallas'])
assert 'sbpy.data.Orbit' in bib.to_text()
bib.reset()
def test_bib(self):
bib.track()
orbit = Orbit.from_horizons('Ceres')
oo_ephem = Ephem.from_oo(orbit, scope='basic')
assert 'sbpy.data.ephem.Ephem.from_oo' in bib.to_text()
def test_timescale(self):
orbit = Orbit.from_horizons('Ceres')
oo_ephem = Ephem.from_oo(orbit, scope='basic')
assert oo_ephem['epoch'].scale == 'tai'
def test_basic(self):
orbit = Orbit.from_horizons('Ceres')
oo_ephem = Ephem.from_oo(orbit, scope='basic')
assert 'dec_rate' not in oo_ephem.field_names
