Voyager 2 photopolarimeter observations of the Uranian satellites

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Polarimeters, Satellite Surfaces, Uranus Satellites, Voyager 2 Spacecraft, Albedo, Chemical Composition, Infrared Spectra, Regolith, Ultraviolet Spectra

Scientific paper

The authors report the ultraviolet (0.25 μm) and infrared (0.75 μm) geometric albedos, phase curves, and phase coefficients for the large Uranian satellites using full disk photometric observations obtained by the photopolarimeter subsystem during the Voyager 2 encounter with the Uranian system. The phase coefficients and phase curves of the Uranian satellites are consistent with surfaces that have a loosely packed regolith with a heavily cratered terrain. Ariel, Titania, and Oberon exhibit a reddening with increasing phase angle of observation. The authors do not observe this effect for Umbriel. They have determined preliminary phase integrals for Ariel, Umbriel, Titania, and Oberon, and they have used this information and the geometric albedos reported herein and previously reported by the Voyager imaging subsystem to derive Bond albedos for the satellites.

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