Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dda....34.0605j&link_type=abstract
American Astronomical Society, DDA meeting #34, #06.05; Bulletin of the American Astronomical Society, Vol. 35, p.1037
Astronomy and Astrophysics
Astronomy
Scientific paper
We have used Saturnian satellite astrometric observations together with the data acquired during the spacecraft flybys of Saturn (Pioneer 11, Voyager 1, and Voyager 2) to develop new satellite and spacecraft ephemerides and a revised gravity field for the Saturnian system. The astrometric data are from the time period 1966 to 2003. The spacecraft data are more extensive than those Campbell and Anderson (1989 AJ 97, 1485) used in their determination of the gravity field. We also included a priori information on Saturn's zonal harmonics from the ringlet constraint devised by Nicholson and Porco (1988 JGR 93, 10209). The gravity parameters found in our analysis are:
GM Enceladus
GM Tethys
GM Dione
5.76&1.30
41.21&0.05
73.13&0.02
J4
J6
J8
-921.&27.
99.&28.
GM Titan
GM Hyperion
GM Iapetus
8978.09&0.88
0.72&0.35‡
131.73&15.08
δ p
˙ αp
˙ δp
40.59550 &0.00360‡
83.53812 &0.00018‡
The GMs of Hyperion and Phoebe are based on assumed densities of 1.1+/-0.5 and 1.3+/-0.5 gm/cm3, respectively. The Saturn pole right ascension α p and declination δ p are from French et al. (1993 Icarus, 103, 163) and their rates are computed from the precession rate of Nicholson et al. (1999 BAAS 31, 1140).
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