Observation and analysis of some recent Galilean satellite phenomena

Details Observation and analysis of some recent Galilean satellite phenomena Observation and analysis of some recent Galilean satellite phenomena

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992em%26p...58..105a&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 58, no. 2, p. 105-114.

Physics

Eclipses, Galilean Satellites, Light Curve, Limb Darkening, Occultation, Curve Fitting, Minima, Penumbras

Scientific paper

Five well observed recent mutual phenomena (1 occultation, 4 eclipses) of the Galilean satellites have been analyzed and four fitting parameters determined for each event. The times of mid-minima are well determined in all cases (generally to within a second or two), but the separation and velocity parameters depend on the penumbral illumination modeling. For this reason, parameters derived from eclipses are somewhat less well determined than from occultations. Taken together with the dependence on the inherent surface reflection properties of the rearward satellite, the results indicate that Asknes et al. (1984) suggestion of order 0.01 arcsec accuracies on positional determinations from mutual phenomena data represents rather a lower limit to the real errors in most cases.

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