The Shape and Surface Variation of 2 Pallas from the Hubble Space Telescope

Details The Shape and Surface Variation of 2 Pallas from the Hubble Space Telescope The Shape and Surface Variation of 2 Pallas from the Hubble Space Telescope

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sci...326..275s&link_type=abstract

Science, Volume 326, Issue 5950, pp. 275- (2009).

Physics

15

Scientific paper

We obtained Hubble Space Telescope images of 2 Pallas in September 2007 that reveal distinct color and albedo variations across the surface of this large asteroid. Pallas’s shape is an ellipsoid with radii of 291 (±9), 278 (±9), and 250 (±9) kilometers, implying a density of 2400 (±250) kilograms per cubic meter—a value consistent with a body that formed from water-rich material. Our observations are consistent with the presence of an impact feature, 240 (±25) kilometers in diameter, within Pallas’s ultraviolet-dark terrain. Our observations imply that Pallas is an intact protoplanet that has undergone impact excavation and probable internal alteration.

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