HST Observations of the Inner Satellites of Neptune

Details HST Observations of the Inner Satellites of Neptune HST Observations of the Inner Satellites of Neptune

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.0805p&link_type=abstract

American Astronomical Society, DDA meeting #30, #08.05; Bulletin of the American Astronomical Society, Vol. 30, p.1144

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Scientific paper

We have obtained 39 HST images of Neptune and inner moons in three HST orbits; two on 3 July, one on 6 July 1997. While the images were intended primarily for astrometric and dynamical studies of the inner moons, they were taken in the F439W, F555W and F791W filters to also obtain some limited photometric data. Of the six inner satellites discovered by Voyager 2, the four outer ones were recovered, as expected, and near their ephemeris positions. The two inner moons were too faint and close to the planet for detection. The faint ring arcs have not yet been detected. Our strategy is to link the inner satellites to Triton, both astrometrically and photometrically. To bridge the large magnitude gap, short and long exposures were obtained. Proteus is unsaturated in all exposures, while Triton is unsaturated in half of them. Proteus will be linked to Triton with the short-exposure frames, and Proteus to the fainter satellites on the long-exposure frames. We will try to calibrate the scale and orientation internally, using the ephemeris position of Triton relative to Neptune. Otherwise, the scale and orientation calibration determined in the HST Uranus inner system study will be used. The corrected mean motions, resulting from these observations, are expected to provide ephemeris predictions accurate to 100 mas for the next half-century.

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