On the theory of the motion of Iapetus

Details On the theory of the motion of Iapetus On the theory of the motion of Iapetus

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..235r&link_type=abstract

Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 235-238.

Astronomy and Astrophysics

Astrophysics

8

Iapetus, Orbital Elements, Planetary Orbits, Satellite Observation, Astronomical Models, Satellite Perturbation, Saturn Rings, Solar Gravitation, Titan, Iapetus, Saturn, Satellites, Perturbation, Motion

Scientific paper

Two theories concerning the motion of Iapetus, the eighth satellite of Saturn, are reviewed: that of Struve (1933) and of Sinclair (1974). Their determinations of epoch longitude shows a saturnicentric difference of 0.12 degrees leading to a geocentric difference of 1.0 arcsec. On the basis of these theories, some disturbing terms are added. These include solar perturbations and perturbations of Titan. This resulting modified theory and observations made from 1888 to 1973 are used to fit the mean motion and epoch longitude of Iapetus. These values are then used to derive residuals which correspond to all the observations used.

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