2019-09-03
SPK file prepared by: Valery Lainey (lainey@imcce.fr)
This file provides JPL/IMCCE ephemeris "NOE-6-2018-MAIN-v2.bsp" of the eight main Saturnian moons
(Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Hyperion, Iapetus).
Ground based, Voyager, HST and Cassini astrometric data were used in the fit.
Covered period: 1870-2052
Polynomial degree: 20
The accuracy of Chebychev representations is better than 20 m (position) and 3.6d-6 km/day (velocity) for all moons.
Reference: Lainey et al. submitted
GMs:
37931322.6256016 +/- 9.13934883042525 (Saturn)
2.50361567349312 +/- 2.154593359403621E-005 (Mimas)
7.20736749379373 +/- 2.728509636868333E-003 (Enceladus)
41.2134496289536 +/- 1.087089354548130E-004 (Tethys)
73.1161583815711 +/- 5.772430080935285E-005 (Dione)
153.910185594341 +/- 0.364354366756117 (Rhea)
8978.11537332073 +/- 8.692595050915262E-002 (Titan)
0.443030634987428 +/- 8.387764842616938E-002 (Hyperion)
127.467858707731 +/- 4.62859986611416 (Iapetus)
J2: 1.629045323885759E-002 +/- 5.726226819352542E-007
J4: -9.412923781284972E-004 +/- 6.913672913625634E-006
J6: 6.080109445357477E-005 +/- 2.592515199831447E-005
Pole (J2000 epoch):
RA0: 40.58180962126801 +/- 0.00029687110647996394
RAdot: -0.05185052862986046 +/- 0.002788193350551259
DE0: 83.53764236439721 +/- 3.531177782902457e-05
DEdot: -0.003923170523152044 +/- 0.0003286489265611484
Forced Nutation model (from sat382.bsp kernel):
3.394578618432000E-02 2.194615419925000E-03 1.296857669242000E-02 !amp RA
3.820609911629000E-03 2.470047204107000E-04 1.296857669242000E-02 !amp DE
5.109270184845000E+01 1.046981232614000E+01 0.000000000000000E+00 !degrees / Julian century
3.362827860448000E+02 3.393234943155000E+01 1.065902989076000E+02 !phase degrees
k2: 0.381844485299200 +/- 5.723461526937057E-003
1/Q:
1.395989070504224E-004 +/- 8.562523420151275E-005 (Mimas)
8.736717909955925E-004 +/- 4.160058708279343E-005 (Enceladus)
1.457310743243154E-004 +/- 2.045932221437600E-005 (Tethys)
2.989706806469259E-004 +/- 7.217159370967345E-005 (Dione)
3.680917653710901E-003 +/- 2.953634361651983E-004 (Rhea)
1.786016415242906E-002 +/- 5.120475781216291E-003 (Titan)
SPK file was generated on Mac OS-X.
Questions, comments or special requests should be sent to V.Lainey (lainey@imcce.fr)
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VL's research was supported by an appointment to the NASA Postdoctoral Program at the NASA Jet Propulsion Laboratory,
California Institute of Technology, administered by Universities Space Research Association under contract with NASA.
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