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The size and albedo of Rosetta fly-by target 21 Lutetia from new IRTF measurements and thermal modeling

Mueller, Michael and Harris, Alan W. and Bus, Schelte J. and Hora, J. L. and Kassis, M. and Adams, J. D. (2006) The size and albedo of Rosetta fly-by target 21 Lutetia from new IRTF measurements and thermal modeling. Astronomy and Astrophysics, 447, pp. 1153-1158. DOI: 10.1051/0004-6361:20053742.

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Official URL: http://www.edpsciences.org/articles/aa/abs/2006/09/aa3742-05/aa3742-05.html

Abstract

Recent spectroscopic observations indicate that the M-type asteroid 21 Lutetia has a primitive, carbonaceous-chondrite-like (C-type) surface composition for which a low geometric albedo would be expected; this is incompatible with the IRAS albedo of 0.221+/- 0.020. From new thermal-infrared spectrophotometric measurements and detailed thermophysical modeling we infer that Lutetia has a diameter of 98.3 +/- 5.9 km and a geometric albedo of 0.208 +/- 0.025, in excellent agreement with the IRAS value. We can thus rule out a low albedo typical of a C-type taxonomic classification. Furthermore, we find that Lutetia's thermal properties are well within the range expected for large asteroids; we find no evidence for unusually high thermal inertia.

Document Type:Article
Title:The size and albedo of Rosetta fly-by target 21 Lutetia from new IRTF measurements and thermal modeling
Authors:
AuthorsInstitution or Email of Authors
Mueller, MichaelUNSPECIFIED
Harris, Alan W.UNSPECIFIED
Bus, Schelte J.Institute for Astronomy, Hilo, HI, USA
Hora, J. L.Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
Kassis, M.Keck observatory
Adams, J. D.Cornell University
Date:March 2006
Journal or Publication Title:Astronomy and Astrophysics
Volume:447
DOI:10.1051/0004-6361:20053742
Page Range:pp. 1153-1158
Status:Published
Keywords:Asteroid
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Müller
Deposited On:01 Mar 2006
Last Modified:12 Dec 2013 20:10

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