Galileo encounter with 951 Gaspra - First pictures of an asteroid

Details Galileo encounter with 951 Gaspra - First pictures of an asteroid Galileo encounter with 951 Gaspra - First pictures of an asteroid

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257.1647b&link_type=abstract

Science (ISSN 0036-8075), vol. 257, no. 5077, p. 1647-1652.

Astronomy and Astrophysics

Astronomy

129

Asteroids, Galileo Spacecraft, Planetary Structure, Albedo, Planetary Craters, Planetary Evolution, Regolith, Spaceborne Astronomy

Scientific paper

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.

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