Abstract
I present new maps, photomosaics and geological interpretations of asteroid 951 Gaspra. Facets and limb concavities suggest a long history of large impacts producing 5 to 7 km diameter craters. Craters 1 to 4 km in diameter date the last facet-forming impact, though it is not clear which facet this formed. These craters are more numerous than previously thought because much of the area seen at high resolution seems to be depleted in these larger craters. Craters in that area probably date the last body-jolting impact. Linear features, probably the surface expressions of deep fractures, form at least two groups with different trends and probably different ages. Previously noted fresh and spectrally distinct materials are concentrated on ridges. One or two dark markings occur on a steep slope seen at high sun. Smooth materials, probably consisting of thicker or more mobile regolith than elsewhere, occur on steep slopes, usually on rotational leading surfaces.
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