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Spice kernels documentation
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Spice kernels data directory]
PAS_to_RTN
We are using a python script using spiceypy library tools to compute PAS to RTN transformation matrix.
Seelink:software/spice/pas_to_rtn.py[]
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OBT is computed from SCET coarse time and fine time
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Epoch is CDF TT2000 computed from SCET, with origin = 2000/01/01 but without spice kernels correction
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UTC is computed from OBT using spice kernels
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ET (Ephemeris Time) computed from OBT using spice kernels
Results for 2020-04-15 (first record)
Filename : /DATA/SOLAR/DATA/L1/20200415/solo_L1_swa-pas-3d_20200415_V00.cdf
OBT : 640266720:32768
Epoch : 2020-04-15T11:52:00.500
UTC : 2020-04-15T11:52:09.806
ET : 640223598.991353
SOLO_SWA_PAS => SOLO_SRF
[[ 1. 0. 0.]
[ 0. -1. 0.]
[ 0. 0. -1.]]
SOLO_SRF => SOLO_SUN_RTN
[[-1.00000000e+00 -7.08106212e-07 4.15344104e-06]
[ 3.37886890e-07 -9.96079099e-01 -8.84671055e-02]
[ 4.19979992e-06 -8.84671055e-02 9.96079099e-01]]
SOLO_SWA_PAS => SOLO_SUN_RTN
[[-1.00000000e+00 7.08106212e-07 -4.15344104e-06]
[ 3.37886890e-07 9.96079099e-01 8.84671055e-02]
[ 4.19979992e-06 8.84671055e-02 -9.96079099e-01]]Results for 2020-06-01 (first record)
Filename : /DATA/SOLAR/DATA/L1/20200601/solo_L1_swa-pas-3d_20200601_V00.cdf
OBT : 644284796:32768
Epoch : 2020-05-31T23:59:56.500
UTC : 2020-06-01T00:00:12.592
ET : 644241681.7770483
SOLO_SWA_PAS => SOLO_SRF
[[ 1. 0. 0.]
[ 0. -1. 0.]
[ 0. 0. -1.]]
SOLO_SRF => SOLO_SUN_RTN
[[-1.00000000e+00 -9.02398598e-07 1.75781989e-06]
[ 7.48669623e-07 -9.96332045e-01 -8.55713475e-02]
[ 1.82859175e-06 -8.55713475e-02 9.96332045e-01]]
SOLO_SWA_PAS => SOLO_SUN_RTN
[[-1.00000000e+00 9.02398598e-07 -1.75781989e-06]
[ 7.48669623e-07 9.96332045e-01 8.55713475e-02]
[ 1.82859175e-06 8.55713475e-02 -9.96332045e-01]]