Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...447.1153m&link_type=abstract
Astronomy and Astrophysics, Volume 447, Issue 3, March I 2006, pp.1153-1158
Astronomy and Astrophysics
Astrophysics
28
Minor Planets, Asteroids, Infrared: Solar System, Radiation Mechanisms: Thermal
Scientific paper
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.
Adams Joseph D.
Bus Schelte J.
Harris Alan W.
Hora Joseph L.
Kassis Marc
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