Io hot spots - Infrared photometry of satellite occultations

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Io, Satellite Surfaces, Satellite Temperature, Thermal Mapping, Galilean Satellites, Infrared Photometry, Occultation, Thermal Emission

Scientific paper

Infrared photometry of occultations of Io by the other Galilean satellites is used to map Io's active hot spots. Excluding a 15° wide longitude strip centered near 215°W, each point on Io's surface was occulted during at least one of seven occultations observed during the latter half of 1985. The greatest spatial resolution and sensitivity to hot spots occurs near the sub-Earth point, which always lies near the equator, and both spatial resolution and sensitivity decrease away from the sub-Earth point due to foreshortening. The astrometric results are compared to existing Galilean satellite ephemerides and are used to improve on them.

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