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Galileo encounter with 951 Gaspra: First pictures of an asteroid

Science

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, , , , , , , , , , , , , , , , , , ,

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Abstract

Galileo images of Gaspra reveal it to be an irregularly shaped object (19 by 12 by 11 kilometers) that appears to have been created by a catastrophic collisional disruption of a precursor parent body. The cratering age of the surface is about 200 million years. Subtle albedo and color variations appear to correlate with morphological features: Brighter materials are associated with craters especially along the crests of ridges, have a stronger 1-micrometer absorption, and may represent freshly excavated mafic materials; darker materials exhibiting a significantly weaker 1-micrometer absorption appear concentrated in interridge areas. One explanation of these patterns is that Gaspra is covered with a thin regolith and that some of this material has migrated downslope in some areas.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Galileo encounter with 951 Gaspra: First pictures of an asteroid
Series title:
Science
Volume
257
Issue:
5077
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1647
Last page:
1652
Number of Pages:
6