Hi there,
I’m trying to use ephemeris with an epoch defined as a FieldAbsoluteDate but the Python wrapper is giving me some difficulties.
Image you have an AbsoluteDate
‘ref_date’ and a Frame
‘ref_frame’. Then:
nvar, order = 3, 1
ds_factory = DSFactory(nvar, order)
var_time = ds_factory.variable(0, 1.)
zero_ds = ds_factory.constant(0.)
solar_system_barycenter = PVCoordinatesProvider.cast_(CelestialBodyFactory.getSolarSystemBarycenter())
var_date = FieldAbsoluteDate(ref_date, var_time)
solar_system_barycenter.getPVCoordinates(var_date, ref_frame)
It gives me the following error:
orekit.InvalidArgsError: (<class ‘org.orekit.utils.PVCoordinatesProvider’>, ‘getPVCoordinates’, (<FieldAbsoluteDate: 2022-03-04T01:53:01.130645Z>, <FactoryManagedFrame: EME2000>))
But from the Java code I do not see what the problem is, as JPLCelestialBody
has a getPVCoordinates
accepting a FieldAbsoluteDate
and a Frame
.
Note that the relevant imports are:
from org.orekit.utils import PVCoordinatesProvider
from org.orekit.bodies import CelestialBodyFactory
from org.orekit.time import FieldAbsoluteDate
from org.hipparchus.analysis.differentiation import DSFactory
Cheers,
Romain.