Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...59..426s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 59, Sept. 1984, p. 426-435.
Astronomy and Astrophysics
Astronomy
41
Astronomical Photometry, Iapetus, Spaceborne Astronomy, Voyager 2 Spacecraft, Albedo, Reflectance, Saturn, Satellites, Iapetus, Photometry, Voyager Missions, Imagery, Phase Angles, Optical Properties, Albedo, Maps, Surface, Distribution, Mapping, Asymmetry, Analysis, Disk, Lightcurves, Shape, Motion, Data, Polar Regions, Equatorial Regions, Reflectance, Patterns, Brightness, Color, Observations
Scientific paper
Voyager images of Saturn's satellite Iapetus ranging in phase angle from 8 to 90 deg have been used to define the satellite's photometric properties and construct an albedo map of its surface. Iapetus shows variations in reflectance across its surface of a factor of 10 to 20, the greatest albedo range known for a solar system object. It is darkest at the apex of orbital motion, becomes brighter away from the apex, and is brightest near the poles. The 'boundary' between light and dark material is gradual rather than sharp. The photometric properties of the surface are adequately described by a lunarlike photometric function, but the surface phase function varies with albedo. The dark material on Iapetus is reddish, the bright material somewhat less so.
Buratti Bonnie
Sagan Carl
Squyres Steve W.
Veverka Joe
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