Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..587r&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.587
Computer Science
Scientific paper
We present observations of asteroid 21 Lutetia collected 2003-2008 using the SpeX instrument on the NASA Infrared Telescope Facility (IRTF) covering 2-4 μm. We also reevaluate NSFCam observations obtained in 1996 [1]. Taken together, these show deeper 3-μm band depths (˜3-5%) in the southern hemisphere of Lutetia, and shallower band depths (≤ 2%) in the north. Such variation is consistent with observations at shorter wavelength by previous workers [2,3], who observed hemisphericlevel variations from C-like spectra to X-like spectra. It is also consistent with Rosetta's reported nondetection of an OH band in Lutetia's northern hemisphere [4]. While the shallowness of absorption bands on Lutetia hinders identification of its surface composition, goethite appears plausible as a constituent in its southern hemisphere [5].
Bus Schelte J.
Clark Beth Ellen
Howell Ellen S.
Ockert-Bell Maureen E.
Rivkin Andrew S.
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