The Possibility of Estimating Tidal Perturbations of Jupiter's Galilean Satellites [chapter]

Jay H. Lieske
1986 Relativity in Celestial Mechanics and Astrometry  
Recent measurements in the infra-red of the energy emitted by Io suggest that if the observed emission is due to tidal dissipation in Io, then one should observe a very large secular acceleration of Io in its orbit. The purpose of this paper is to investigate the observational evidence which might be examined to verify that hypothesis. We have assembled the largest collection of eclipse observations extant and investigate the possibility of observing secular drifts in the period of Io. Analysis
more » ... iod of Io. Analysis of eclipse observations requires the knowledge of good tables of AT and we explore the implications of the standard lunar acceleration of Spencer-Jones riM oon = -22.44 arcsec/cy 2 versus that of Morrison and Ward hj^o on = -26.0 arcsec/cy 2 . Preliminary results suggest that large tidal accelerations of Jupiter's satellites do not exist at the suggested magnitude and hence the heat flux measurements probably represent an episodic occurrence. 117 J. Kovalevsky and V. A. Brumberg (eds.), Relativity in Celestial Mechanics and Astrometry, 117-125. ©1986 by the IAU. available at https://doi.
doi:10.1007/978-94-009-4602-6_16 fatcat:asqjrtjwnbhz7fb2ymt6ea2nme