The Inhomogeneous Surface of Centaur 32522 Thereus (2001 PT13)

Details The Inhomogeneous Surface of Centaur 32522 Thereus (2001 PT13) The Inhomogeneous Surface of Centaur 32522 Thereus (2001 PT13)

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...630l..93l&link_type=abstract

The Astrophysical Journal, Volume 630, Issue 1, pp. L93-L96.

Astronomy and Astrophysics

Astronomy

9

Minor Planets, Asteroids

Scientific paper

Eight low-resolution near-infrared spectra (0.8-2.4 μm) of 32522 Thereus were obtained on 2002 August 28 from 0:30 to 5:30 UT, covering more than half of its rotation period, with the 3.56 m Telescopio Nazionale Galileo (TNG) at El Roque de los Muchachos Observatory (ORM, Canary Islands, Spain). All the spectra are red, probably due to a mantle of organic materials resulting from long-term irradiation. During at least 1.5 hr, the spectra clearly present the typical water ice absorption bands at 1.5 and 2.0 μm indicative of an inhomogeneous surface with a major concentration of water ice in part of it. One possible scenario is that a collision destroyed part of the irradiation mantle and moved ice from below to the surface, part of the material being vaporized over the surface by the impact.

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