Investigating the Outburst of Asteroid 596 Scheila: Main Belt Comet vs Collisional Origin

Details Investigating the Outburst of Asteroid 596 Scheila: Main Belt Comet vs Collisional Origin Investigating the Outburst of Asteroid 596 Scheila: Main Belt Comet vs Collisional Origin

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12435j&link_type=abstract

HST Proposal ID #12435. Cycle 18

Physics

Scientific paper

On 2010 Dec 11 the Catalina Sky Survey discovered a coma around the 113km asteroid 596 Scheila. Mass loss from such a large, slowly rotating object {escape speed 50 m/s} is unprecedented.? It can only be driven by impact or by drag forces from sublimated gas, as occurs in classical comets.? We propose a 2-orbit Hubble investigation of 596 Scheila to decide between these alternatives and to assess variability in the near-nucleus environment. Deep images will be used to examine fine-scale coma structures including jets and decameter-sized fragments, if present, and to measure the expansion velocities of the ejected material.? With its high spatial resolutionand point-spread-function stability, Hubble is uniquely suited to this investigation.;

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