2007A&A...470.1157N


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET10:10:14

2007A&A...470.1157N - Astronomy and Astrophysics, volume 470, 1157-1164 (2007/8-2)

Near infra-red spectroscopy of the asteroid 21 Lutetia. II. Rotationally resolved spectroscopy of the surface.

NEDELCU D.A., BIRLAN M., VERNAZZA P., DESCAMPS P., BINZEL R.P., COLAS F., KRYSZCZYNSKA A. and BUS S.J.

Abstract (from CDS):

In the framework of the ground-based science campaign dedicated to the encounter with the Rosetta spacecraft, the mineralogy of the asteroid (21) Lutetia was investigated. Near-infrared (NIR) spectra of the asteroid in the 0.8-2.5µm spectral range were obtained with SpeX/IRTF in remote observing mode from Meudon, France in March and April 2006. We analysed these data together with previously acquired spectra - March 2003, August 2004. I-band relative photometric data obtained on 20 January 2006 using the 105cm telescope from Pic du Midi, France has been used to build the ephemeris for physical observations. A χ2 test using meteorite spectra from the RELAB database was performed in order to find the best fit of complete visible + infrared (VNIR) spectra of Lutetia. The new spectra reveal no absorption features. We find a clear spectral variation (slope), and a good correspondence between spectral variations and rotational phase. Two of the most different spectra correspond to two opposite sides of the asteroid (sub-Earth longitude difference around 180°). For the neutral spectra a carbonaceous chondrite spectrum yields the best fit, while for those with a slightly positive slope the enstatitic chondrite spectra are the best analog. Based on the chosen subset of the meteorite samples, our analysis suggests a primitive, chondritic nature for (21) Lutetia. Differences in spectra are interpreted in terms of the coexistence of several lithologies on the surface where the aqueous alteration played an important role.

Abstract Copyright:

Journal keyword(s): minor planets - asteroids - techniques: spectroscopic - methods: observational

Simbad objects: 3

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Number of rows : 3

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 76332 PM* 08 56 22.9509505486 +28 40 04.379927231   9.20 8.58     G2V 25 0
2 HD 87680 * 10 07 14.7865955891 +29 14 15.863552758   8.60 7.98     G2V 32 0
3 HD 88371 PM* 10 11 48.0685636384 +23 45 18.705316029   9.06   8.0   G2V 80 0

    Equat.    Gal    SGal    Ecl

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2019.11.19-10:10:14

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