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Published March 1981 | public
Journal Article

Near-infrared spectrophotometry of the satellites and rings of Uranus


New spectrophotometry from 1.5 to 2.5 μm is reported for the Uranian satellites Titania, Oberon, and Umbriel. A spectrum of the rings of Uranus from 2.0 to 2.4 μm is also reported. No evidence is found for frost covering the surface of the ring material, consistent with the low albedo of the rings (P_K = 0.03) previously reported by Nicholson and Jones (1980). The surfaces of the satellites are found to be covered by dirty water frost. Assuming albedos of the frost and gray components covering the Uranian satellites to be the same as the light and dark faces of Iapetus, radii are derived that are roughly twice those inferred from the assumption of a visual albedo of 0.5.

Additional Information

© 1981 Elsevier Inc. Received 24 November 1980, Revised 10 February 1981. We thank Juan Carrasco for assistance with the observations. This research was supported by grants from NASA.

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