Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..933h&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.933
Physics
Scientific paper
On July 10th 2010 the ESA Rosetta spacecraft flew past the asteroid 21-Lutetia on the way to it's 2014 rendezvous with Comet 67P/Churyumov- Gerasimenko. The closest distance to the asteroid was 3160 km. During the fly-by the asteroid was observed with all the remote sensing instruments of the Rosetta spacecraft. 21-Lutetia is the largest asteroid yet visited by a spacecraft. The surface shows a highly impacted surface with the largest impact craters reaching ~70km. The surface is covered in a layer of regolith with a thickness that in regions is greater than 500m (possibly much more). 21-Lutetia shows an almost featureless reflection spectrum which is almost flat from 250nm to 5000nm with a surprising small drop-off in the UV part of the spectrum. The surface of 21-Lutetia shows very small color variegation and photometric properties indicative of a very fine grained regolith. This paper will discuss what can be learned about the properties of the 21-lutetia regolith from the Rosetta fly-by data together with ground based observational data.
Faurschou Hviid S.
Schröder Stefan E.
Uwe Keller Horst
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