Separate Lightcurves of Pluto and Charon-Split of 3848

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hst Proposal Id #5020

Scientific paper

With this program we will begin a systematic effort to collect separate lightcurve data on the Pluto and Charon system. Such observations will continue to improve the albedo mapping of their surfaces by splitting the present ground-based ambiguity in the combined lightcurve. The 3848 obs. must be done at the such times when it is within 25 arcseconds of a star of similar brightness. Such data will provide both the lightcurves and the phase angle behavior of each object. In addition to the photometry, astrometric measurements of Pluto and Charon relative to each of the background field stars can be made from the imaging data. In sufficient quantity, these data will further refine our knowledge of the sizes and relative masses of Pluto and Charon. Continued work on the photometry will allow us to watch the lightcurve evolution as Pluto moves away from the sun and as the Sun progresses to higher and higher latitudes. 5020 is a continuation of 3848, replacing obs. lost in the safing event of Mar. 1993., and due to subsequent pointing restrictions. 5020 measures the Pluto-Charon system and the stars separately.

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