2007A&A...473L..33N


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.23CET18:36:24

2007A&A...473L..33N - Astronomy and Astrophysics, volume 473, L33-36 (2007/10-3)

E-type asteroid (2867) Steins: flyby target for Rosetta.

NEDELCU D.A., BIRLAN M., VERNAZZA P., BINZEL R.P., FULCHIGNONI M. and BARUCCI M.A.

Abstract (from CDS):

The mineralogy of the asteroid (2867) Steins was investigated in the framework of a ground-based science campaign dedicated to the future encounter with Rosetta spacecraft. Near-infrared (NIR) spectra of the asteroid in the 0.8-2.5µm spectral range have been obtained with SpeX/IRTF in remote-observing mode from Meudon, France, and Cambridge, MA, in December 2006 and in January and March 2007. A spectrum with a combined wavelength coverage from 0.4 to 2.5µm was constructed using previously obtained visible data. To constrain the possible composition of the surface, we constructed a simple mixing model using a linear (areal) mix of three components obtained from the RELAB database. A space-weathering model was applied to the aubrite ALH-78113 spectrum. The four new NIR spectra reveal no major absorption features. The best-fit model for the constructed visible-plus-NIR spectrum is represented by a mixture of 57% enstatite, 42% oldhamite, and 1% orthopyroxene. These results place Steins in a subdivision of the E-type class with objects like Angelina, Eger, and Nereus. This group is not sampled by the current collection of aubrite meteorites. Interestingly, the reddened aubrite spectrum also provides a good match to the Steins VNIR spectrum.

Abstract Copyright:

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

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 259516 PM* 06 34 19.1790441442 +31 00 40.934455752   9.85 9.23     G2V 6 0
2 BD+00 2717 * 10 57 04.0449104240 -00 13 12.886842194 10.822 10.567 9.903 9.537 9.206 ~ 54 0

    Equat.    Gal    SGal    Ecl

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2020.02.23-18:36:24

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