Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p12a..08m&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #P12A-08
Physics
6008 Composition (1060), 6055 Surfaces
Scientific paper
The Rosetta spacecraft flew by asteroid 2867 Steins in September 2008, collecting images, UV, visible and IR spectra and radar reflections. A flyby of the ˜95 km diameter asteroid 21 Lutetia is scheduled for July, 2010. Laboratory studies using meteoritic and terrestrial samples are designed to support interpretation of the observations of the asteroid targets. The goal is to study likely meteoritic analogues of Steins and Lutetia in several laboratories using the same samples in multiple experiments simulating the conditions and types of measurements made during the flybys. The first sample, 5g of an aubrite, ALHA78113,82, is an achondrite consisting of very low iron, high magnesium silicates, with small amounts of metallic and sulfide grains that may be a fragment from Steins. Chips and powdered samples have been measured in reflectance at Brown University, RELAB. Spectral imaging in visible, at INAF, Roma, was conducted on a chip before it was powdered. The spectrum has high albedo (20-40%) depending on grain size and abundance of opaque minerals. It also has an ultraviolet absorption band with two slopes and no 1- nor 2-μm bands. There is no absorption at 0.5 μm as there is in telescopic spectra of Steins. There are two separate questions related to aubrites and Steins. First, what is the nature of the absorption band first measured in the sample of ALH78113,101 at 0.42 μm? And quite separately, what is the spectroscopically active feature in the ground-based spectrum and OSIRIS photometry of Steins at 0.50 μm? Polarization and phase functions have been measured by PROGRA2-vis and -surf covering 6-150° at two wavelengths. Very small phase angle measurements are planned at Kharkiv, and ultraviolet spectra will be measured at Southwest Research Institute, Boulder along with olivine, enstatite, troilite (FeS) and Fe0. Plans are developing to measure the dielectric constant and magnetic susceptibility of the sample. Irradiated samples simulating space exposure will be measured last as it will damage the sample.
A'Hearn Michael F.
Ammanito Eleonora
Cloutis Edward
Coradini Angioletta
de sanctis M.
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