Python example 5.1_TLE_Propagation.ipynb doesn't work

Orekit Python Wrapper usage
1

Sorry new to python but the example throws an error at this line:
pv = propagator.getPVCoordinates(extrapDate, inertialFrame)

I get the following error:
AttributeError: ‘super’ object has no attribute ‘getPVCoordinates’

Any help is greatly appreciated

2

Hi there,

This is a reccurrent problem with the python wrapper. Methods must be called via the class in their hierarchy that define them (see another case here). I suspect here you need to do:

PVCoordinatesProvider.cast_
(propagator)

Before calling getPVCoordinates.
Sorry if the examples in the repo are not up to date with Orekit 12.2. Please consider using the alternative wrapper based on jpype tech, there’s no need for such casts

Cheers,
Romain.

1 Like
3

Thank you very helpful! Resolved my problem.

4

This does not work for me.

# Python version: 3.12.8 | packaged by conda-forge | (main, Dec  5 2024, 14:24:40) [GCC 13.3.0]
# Java version: 1.8.0_412
# Orekit version: 12.2

from org.orekit.propagation.analytical.tle import TLE, TLEPropagator
from org.orekit.frames import FramesFactory
from org.orekit.utils import IERSConventions, PVCoordinatesProvider
from org.orekit.time import TimeScalesFactory, AbsoluteDate
tle_line1 = "1 27421U 02021A   02124.48976499 -.00021470  00000-0 -89879-2 0    20"
tle_line2 = "2 27421  98.7490 199.5121 0001333 133.9522 226.1918 14.26113993    62"
mytle = TLE(tle_line1,tle_line2)
extrapDate = AbsoluteDate(2002, 5, 7, 12, 0, 0.0, TimeScalesFactory.getUTC())
inertialFrame = FramesFactory.getEME2000()
propagator = TLEPropagator.selectExtrapolator(mytle)
PVCoordinatesProvider.cast_(propagator)
pv = propagator.getPVCoordinates(extrapDate, inertialFrame)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[2], line 12
     10 propagator = TLEPropagator.selectExtrapolator(mytle)
     11 PVCoordinatesProvider.cast_(propagator)
---> 12 pv = propagator.getPVCoordinates(extrapDate, inertialFrame)

AttributeError: 'super' object has no attribute 'getPVCoordinates'
5

I see, it needs to be set
propagator = PVCoordinatesProvider.cast_(propagator)

1 Like