Physics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26...24h&link_type=abstract
Icarus, vol. 26, Sept. 1975, p. 24-29.
Physics
4
Albedo, Infrared Radiation, Io, Natural Satellites, Satellite Rotation, Jupiter (Planet), Planetary Radiation, Spectrum Analysis
Scientific paper
Infrared (1.5-5 microns) albedos and rotation curves of the Galilean satellites have been obtained. The data suggest that the rotational variation in the infrared is less than plus or minus 10% for all four satellites. While no conclusion about rotational variation could be reached for Io, the 1.57-micron data for the outer three satellites marginally suggest phase correlation with the visual variation. The geometric albedos obtained are in general agreement with earlier results. For Io, the absorption feature near 1.5 microns found by Pilcher et al. (1972) is confirmed, thus contradicting the flat spectrum measured by Fink et al. (1973). Io and Ganymede were observed in the 1.57-micron bandpass as they reappeared from eclipse. The curve for Io shows a slight (less than 10%) overshoot similar to those sometimes reported for visual measurements. This result is based on a single reappearance, and is extremely tentative.
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