Mutual phenomena of the Galilean satellites in 1973. III - Final results from 91 light curves

Details Mutual phenomena of the Galilean satellites in 1973. III - Final results from 91 light curves Mutual phenomena of the Galilean satellites in 1973. III - Final results from 91 light curves

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81..464a&link_type=abstract

Astronomical Journal, vol. 81, June 1976, p. 464-481.

Other

34

Eclipses, Galilean Satellites, Light Curve, Occultation, Tables (Data), Astrometry, Astronomical Photometry, Jupiter (Planet), Latitude, Longitude, Planetary Orbits, Position (Location)

Scientific paper

This paper presents an analysis of photoelectric light curves of 91 mutual eclipses and occultations of the Galilean satellites that occurred from June to December 1973. From the deepest curves, radii and standard errors are deduced for J2, J3, and J4. It is shown that the substantial differences between the depths and midtimes observed and those predicted by Sampson's theory can be used in a clear and definite way to revise the orbital constants of that theory. The present analysis, which reduces all the data provided by these mutual events in one body, diminishes the latitude and longitude residuals of the unrevised theory by as much as a factor of about 10. The resulting overall consistency and the demonstrated inadequacy of an explanation based solely on surface-brightness variations argue that these corrections do represent the dominant effects required to account for the light curves. In order that these mutual events can be used with other astrometric data, the separations between a satellite pair at midevent are given. A small systematic (with solar phase angle) and unexplained difference in the longitude corrections is found for Io and Europa as obtained from nearly simultaneous pairs of occultations and eclipses.

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