Near infra-red spectroscopy of the asteroid 21 Lutetia. I. New results of long-term campaignReportar como inadecuado

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1 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides 2 LESIA - Laboratoire d-études spatiales et d-instrumentation en astrophysique 3 EAPS - Department of Earth, Atmospheric and Planetary Sciences MIT, Cambridge 4 Institute for astronomy

Abstract : Aims. Investigation of the physical nature of the asteroid 21 Lutetia, target of Rosetta mission, is required for the completion of its ground-based science and in the frame of its future fly-by. Monitoring this object is essential in preparing the future encounter with the spacecraft. Methods. The asteroid was observed with SpeX-IRTF in the spectral region 0.9−4.0 μm, in remote observing mode from Meudon, in March 2003 and August 2004. Results. The new spectrum in the range 0.9−2.5 μm confirms the previous results Birlan et al. 2004, for a neutral trend with a large shallow band around 1 μm. The spectral region around 3 μm is usually considered as a tracer of aqueous alteration of the surface. The 3 μm band in Lutetias- spectrum is shallower than those of hydrated asteroids, and the 2.9 vs. 3.2 ratio reveals a value close to the CV−CO meteorites. The band around 3.1 μm, if it exists in the spectrum of 21 Lutetia, is different from the one present in the spectrum of 1 Ceres, and is lower than 0.5%.

Keywords : minor planets asteroids techniques: spectroscopic methods: observational

Autor: Mirel Birlan - Pierre Vernazza - Marcello Fulchignoni - Maria Antonietta Barucci - Pascal Descamps - Richard P. Binzel - Schelte



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