Ultraviolet Exploration of 21 Lutetia by the Alice UV Spectrometer Aboard Rosetta

Details Ultraviolet Exploration of 21 Lutetia by the Alice UV Spectrometer Aboard Rosetta Ultraviolet Exploration of 21 Lutetia by the Alice UV Spectrometer Aboard Rosetta

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p14b..05p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P14B-05

Physics

[6055] Planetary Sciences: Comets And Small Bodies / Surfaces, [6205] Planetary Sciences: Solar System Objects / Asteroids

Scientific paper

The NASA Alice UV imaging spectrometer aboard the ESA Rosetta comet orbiter successfully conducted an array of flyby observations of asteroid 21 Lutetia in the days surrounding Rosetta’s closest approach to Lutetia on 10 July 2010. Lutetia is over 100 km across, and is the largest asteroid yet reconnoitered by spacecraft. Alice observations included a search for emission lines from gas around Lutetia, rotationally resolved FUV spectral observations of the surface, and spatially resolved studies of surface variegation made near closest approach. All these observations were successful and achieved useful SNR. As a result of the Alice observations, Lutetia is the first asteroid to be spatially resolved in the UV by a flyby spacecraft. We will summarize the Rosetta-Alice Lutetia dataset, and present preliminary results of each of the investigations outlined above. We will also compare the FUV/EUV reflectance of Lutetia to the E-type asteroid 2867 Steins, which was also observed by Alice when Rosetta encountered that much smaller body on 5 September 2008. Among our findings, we report that Lutetia is significantly redder than Steins in the FUV.

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