Publication Date:
1992-09-18
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Belton, M J -- Veverka, J -- Thomas, P -- Helfenstein, P -- Simonelli, D -- Chapman, C -- Davies, M E -- Greeley, R -- Greenberg, R -- Head, J -- Murchie, S -- Klaasen, K -- Johnson, T V -- McEwen, A -- Morrison, D -- Neukum, G -- Fanale, F -- Anger, C -- Carr, M -- Pilcher, C -- New York, N.Y. -- Science. 1992 Sep 18;257(5077):1647-52.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17841160" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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