Volume 447, Number 3, March I 2006
|Page(s)||1153 - 1158|
|Section||Planets and planetary systems|
|Published online||10 February 2006|
The size and albedo of Rosetta fly-by target 21 Lutetia from new IRTF measurements and thermal modeling
DLR Institute of Planetary Research, Rutherfordstr. 2, 12489 Berlin, Germany e-mail: email@example.com
2 Institute for Astronomy, 640 North A'ohoku Place, Hilo, HI 96720, USA
3 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-65, Cambridge, MA 02138-1516, USA
4 Keck Observatory, 65-1120 Mamalahoa Highway, Kamuela, HI 96743, USA
5 Cornell University, 206 Space Science Bldg., Ithaca, NY 14853, USA
Accepted: 11 October 2005
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 . From new thermal-infrared spectrophotometric measurements and detailed thermophysical modeling we infer that Lutetia has a diameter of km and a geometric albedo of , 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.
Key words: minor planets, asteroids / infrared: solar system / radiation mechanisms: thermal
© ESO, 2006
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