Evidence for frost on Rhea's surface

Details Evidence for frost on Rhea's surface Evidence for frost on Rhea's surface

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...24..428j&link_type=abstract

(International Astronomical Union, Colloquium on Planetary Satellites, Cornell University, Ithaca, N.Y., Aug. 18-21, 1974.) Icar

Astronomy and Astrophysics

Astronomy

8

Frost, Natural Satellites, Optical Properties, Saturn (Planet), Surface Properties, Absorption Spectra, Albedo, Astronomical Photometry, Infrared Spectra, Spectral Bands, Spectral Reflectance

Scientific paper

We have observed Rhea (S5) at 1.6 and 2.2 microns at Mt. Wilson using the Caltech photometer on the 1.52 m and 2.54 m telescopes. The infrared spectral reflectances relative to 0.55 micron are 0.8 at 1.65 micron and 0.6 at 2.2 microns. Such absorption bands in the near infrared are not consistent with spectra of most rocks or minerals; even carbonaceous chondritic materials have nearly flat reflectances over this spectral region. Frosts, however, have strong absorption bands in the 1-3 microns region. In particular, the broadband infrared reflectances of Rhea are similar to those of the Galilean satellites Europa (J2) and Ganymede (J3) and also the rings of Saturn. Rhea's low density, high albedo and relatively flat reflectance from 0.3 to 1.1 micron as well as the low infrared reflectances reported here are consistent with the presence of water ice on Rhea's surface.

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