A Comprehensive Survey of Neptune's Small Moons and Faint Rings

Details A Comprehensive Survey of Neptune's Small Moons and Faint Rings A Comprehensive Survey of Neptune's Small Moons and Faint Rings

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11656s&link_type=abstract

HST Proposal ID #11656. Cycle 17

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Scientific paper

We will use a subarray of the WFC3/UVIS to study the inner rings, arcs and moons of Neptune with a sensitivity that exceeds that achieved by any previous observations, including Voyager 2 during its 1989 flyby. Our study will reveal any inner moons down to V magnitude 25, corresponding to a radius 20 km {assuming 9% albedo}, to address a peculiar, apparent truncation in the size distribution of inner moons and to look for the "shepherds" and source bodies for Neptune's dusty rings. {For comparison, the radius of Neptune's smallest known regular moon, Naiad, is 33 km.} Monitoring of the arcs at fine resolution and sensitivity will reveal their ongoing evolution more clearly and will enable us to assess the role of Galatea, whose resonant perturbations are widely believed to confine the arcs. Our study will also reveal any broad, faint rings with optical depth 10^-6, comparable to those now known to encircle all of the other giant planets.;

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