The Orientation of the Pole of Jupiter

Details The Orientation of the Pole of Jupiter The Orientation of the Pole of Jupiter

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dda....33.0702j&link_type=abstract

American Astronomical Society, DDA Meeting #33, #07.02; Bulletin of the American Astronomical Society, Vol. 34, p.936

Astronomy and Astrophysics

Astronomy

2

Scientific paper

George Null (1976 AJ 81, 1153) determined the orientation of the Jovian pole from a combination of Pioneer 10 and 11 tracking data. The IAU adopted his pole (Davies et al. 1980 Celest. Mech. 22, 205) together with rates derived from the motion of the Jovian equator in Lieske's Galilean satellite theory (Lieske 1980 A&A 82, 340). Campbell and Synnott (1985 AJ 90, 364) added the Voyager tracking data to the Pioneer data and redetermined the pole, changing it little from Null's value. The IAU pole direction was precessed to the J2000 system in 1983 (Davies et al. 1983 Celest. Mech. 29, 309). We have been using the data from the Pioneer, Voyager, Ulysses, Galileo, and Cassini spacecraft together with Earth based observations in an effort to determine the gravity field of Jupiter and its Galilean satellites and to improve the ephemerides of those bodies. In our analysis we found that we were unable to adequately process the data when we used the IAU pole model which ignores the significant 30 year periodic perturbation induced by Europa. Our current model obtains the pole orientation by numerically integrating Jupiter's rotational equations of motion with torques due to the Galilean satellites, Saturn, and the Sun. The ICRF right ascension and declination of the pole at epoch J2000 that we have determined from the fit to the data are 268.0573o+/-0.0008o and 64.4958oo. The numerically integrated pole may be approximated to an accuracy of 0.0001o by: α = 268.05815o - 0.00496o T - 0.00012o\sinΩ1 Å + 0.00095o\sinΩ2 Å + 0.00129o\sinΩ3 δ= 64.49585o + 0.00195o T - 0.00005o\cosΩ1 + 0.00041o\cosΩ2 Å + 0.00056o\cosΩ3 where\quadΩ1 = 278.121802o + 4842.80o T \qquadΩ2 = 176.060293o + 1191.64o T Ω3 = 304.517402o + 271.98o T and\quad T = Julian centuries from epoch J2000 .

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