Eclipses and Occultations of Saturn's Satellites in 1995.

Details Eclipses and Occultations of Saturn's Satellites in 1995. Eclipses and Occultations of Saturn's Satellites in 1995.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0415n&link_type=abstract

American Astronomical Society, DPS meeting #28, #04.15; Bulletin of the American Astronomical Society, Vol. 28, p.1073

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Scientific paper

During the passages of the Earth and Sun through Saturn's ring plane in August and November 1995, observations of a total of 24 satellite eclipses and occultations by Saturn (or its rings) were made at the Palomar 5m Hale Telescope, along with two mutual events and the egress occultation of the star GSC 5249-01240. All observations were made using the InSb Cassegrain Infrared Camera, with a 2.3 mu m methane filter and a sampling interval of 6 sec. Our program concentrated on events involving Mimas, due to its relatively poorly-known orbit compared to the other major satellites, and on the coorbital moons Janus and Epimetheus. These events typically occur within 2'' of Saturn's limb, and were observable only in the near-IR. In August, 2 planetary eclipses and 4 occultations of Mimas, as well as 3 eclipses by the rings indicated a systematic deviation (O-C) of 1.3 min (corresponding to an error in orbital longitude, Delta lambda = -0.35deg or -1100 km) relative to the analytical ephemeris of Harper & Taylor [A&A 268, 326 (1993)]. This is similar to the -0.47deg observed in HST images [Nicholson et al. Science 272, 509 (1996)]. A pair of very shallow ring occultations of Mimas in November showed a smaller deviation from the HT93 ephemeris, but an unexpectedly large deviation (4.5 min) from the quasi-analytical model of Vienne & Duriez [A&A 297, 588 (1995)]. This is probably due to a small latitude error in this ephemeris. Single occultations or eclipses of Enceladus, Tethys and Dione showed residuals of <=50 sec relative to HT93, indicating ephemeris errors of 0.1deg ( ~ 500 km) or smaller. The two mutual events observed (Rhea occulting Enceladus on 16 August and Tethys eclipsing Mimas on 22 November) agreed with the predictions of Arlot & Thuillot [Icarus 105, 427 (1993)] to <=25 sec. Three eclipses and one occultation of the coorbital satellites showed a mean deviation (O-C) of 1.0 min (Delta lambda = -0.35deg ) relative to Yoder's ephemeris [Icarus 100, 464 (1992)].

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