Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...473l..33n&link_type=abstract
Astronomy and Astrophysics, Volume 473, Issue 3, October III 2007, pp.L33-L36
Astronomy and Astrophysics
Astrophysics
9
Minor Planets, Asteroids, Techniques: Spectroscopic, Methods: Observational
Scientific paper
Aims: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. Methods: Near-infrared (NIR) spectra of the asteroid in the 0.8-2.5 μm 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 2.5 μm 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. Results: 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.
Barucci Maria-Antonella
Binzel Richard P.
Birlan Mirel
Fulchignoni Marcello
Nedelcu Dan Alin
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