Ground based science of ESA's Rosetta mission targets: (21) Lutetia and (2867) Steins

Details Ground based science of ESA's Rosetta mission targets: (21) Lutetia and (2867) Steins Ground based science of ESA's Rosetta mission targets: (21) Lutetia and (2867) Steins

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1043..171n&link_type=abstract

EXPLORING THE SOLAR SYSTEM AND THE UNIVERSE. AIP Conference Proceedings, Volume 1043, pp. 171-174 (2008).

Computer Science

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Artificial Earth Satellites, Astronomical Observations, Astronomical And Space-Research Instrumentation, Interstellar Medium And Nebulae In External Galaxies, Asteroids, Meteoroids, Spectroscopy And Spectrophotometry, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.

Scientific paper

In the framework of ground-based science campaign dedicated to the encounter with Rosetta spacecraft, the mineralogies of the asteroids (21) Lutetia and (2867) Steins were investigated. 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 March, April and December 2006 and in January and March 2007. 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. To constrain the possible composition of Steins' 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. In the case of (21) Lutetia we find a clear spectral variation (slope), and a good correspondence between spectral variations and rotational phase. The surface mixing model places Steins in a subdivision of the E-type class with objects like Angelina, Eger, and Nereus, a group not sampled by the current collection of aubrite meteorites.

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