Near-Infrared Spectroscopy of 133P/Elst-Pizarro

Details Near-Infrared Spectroscopy of 133P/Elst-Pizarro Near-Infrared Spectroscopy of 133P/Elst-Pizarro

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3711r&link_type=abstract

American Astronomical Society, DPS meeting #41, #37.11

Astronomy and Astrophysics

Astronomy

Scientific paper

Comet 133P/Elst-Pizarro was originally discovered in 1979 as a main-belt asteroid and was rediscovered as a comet in 1996. Different studies have been focused on this "intermediate case" object that aimed at explaining the enigmatic comet-like activity behavior of this main-belt asteroid. We have investigated the surface composition of this object with the near-infrared integral field spectrograph SINFONI at the 8.2-m Very Large Telescope in J, H, and K bands during its 2007 perihelion passage. The goal of these observations was to attempt detection of water ice absorption bands. We present the details of the data processing, the results of these observations, and our compositional modeling of the final spectrum. We show that this spectrum do not reveal spectral bands that could be attributed to water ice. Still, our modeling agrees with a 7-10% value for 133P/Elst-Pizarro albedo, and is compatible with an intimate mixture of water ice, black carbon and Tholin for its composition.

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