2010A&A...513L...4P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST21:45:52

2010A&A...513L...4P - Astronomy and Astrophysics, volume 513, L4-4 (2010/4-1)

Inhomogeneities on the surface of 21 Lutetia, the asteroid target of the Rosetta mission. Ground-based results before the Rosetta fly-by.

PERNA D., DOTTO E., LAZZARIN M., MAGRIN S., FULCHIGNONI M., BARUCCI M.A., FORNASIER S., MARCHI S. and BARBIERI C.

Abstract (from CDS):

In July 2010 the ESA spacecraft Rosetta will fly by the main belt asteroid 21 Lutetia. Several observations of this asteroid have been performed so far, but its surface composition and nature are still a matter of debate. For a long time Lutetia was supposed to have a metallic nature due to its high IRAS albedo. Later on it has been suggested that the asteroid has a surface composition similar to primitive carbonaceous chondrite meteorites, while further observations proposed a possible genetic link with more evolved enstatite chondrite meteorites. We performed visible spectroscopic observations of 21 Lutetia in November 2008 at the Telescopio Nazionale Galileo (TNG, La Palma, Spain) to make a decisive contribution to solving the conundrum of its nature. Thirteen visible spectra were acquired at different rotational phases and subsequently analyzed. We confirm a narrow spectral feature at about 0.47-0.48µm which was already found by Lazzarin et al. (2004A&A...425L..25L) in the spectra of Lutetia. We also confirm an earlier find of Lazzarin et al. (2004A&A...425L..25L), who detected a spectral feature at about 0.6µm in one of their Lutetia's spectra. More remarkable is the difference of our spectra though, which exhibit different spectral slopes between 0.6 and 0.75µm and, in particular, we found that up to 20% of the Lutetia surface could have flatter spectra. We detected a variation of the spectral slopes at different rotational phases that could be interpreted as possibly due to differences in the chemical/mineralogical composition as well as to inhomogeneities of the structure of the Lutetia's surface (e.g., to craters or albedo spots) in the southern hemisphere.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - minor planets, asteroids: individual: Lutetia

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 28099 BY* 04 26 40.1215422118 +16 44 48.884181598 8.98 8.78 8.12 7.56 7.23 G2+V 371 0
2 HD 292561 * 06 51 33.7279121561 -00 11 31.522487958 11.277 11.183 10.574 10.226 9.905 F8 45 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-21:45:52

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