Visible Spectroscopic Study of THEMIS Family

Details Visible Spectroscopic Study of THEMIS Family Visible Spectroscopic Study of THEMIS Family

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.5515l&link_type=abstract

American Astronomical Society, DPS meeting #30, #55.P15; Bulletin of the American Astronomical Society, Vol. 30, p.1450

Astronomy and Astrophysics

Astronomy

Scientific paper

We present visible spectroscopic observations of 36 asteroid members of the Themis family. These observations were carried on at the European Southern Observatory, during 1996-97-98, in the wavelength range of 4900 -- 9200 Angstroms. Most of the objects show similar featureless spectra, characteristic of C-, B-, F- and G-type asteroids. A very limited spread of the distribution of superficial composition is apparent, smaller than in bakground objects, indicating a probable common origin. Two objects, 461 Saskia and 1171 Rusthawelia, display P-type spectra. Indication of aqueous alteration is clear in 15 object and is possibly present in 11 more. This result tends to indicate that the parent-body of Themis family was probably thermally metamorphosed. A small correlation between albedos and diameters is also found: as the asteroid diameter decreases a larger dispersion of albedos is present and higher albedos are displayed by smaller asteroids

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