Other
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1581y&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1581
Other
Scientific paper
Asteroid (596) Scheila was reported to exhibit a cometary appearance and an increase in brightness on UT 2010 December 11. We used the IRCS spectrograph on the 8-m Subaru telescope to obtain mediumresolution spectra of Scheila in the HK-band (1.4 - 2.5 μm) and low-resolution spectra in the KL-band (2.0 - 4.2 μm) on UT 2010 December 13 and 14. In addition, we obtained low-resolution spectroscopy using the SpeX spectrograph on the 3-m IRTF telescope on UT 2011 January 04 and 05. The spectrum of Scheila shows a consistent red slope from 0.8 to 4.0 μm with no apparent absorption features, resembling spectra of D-type asteroids. An intimate mixing model suggests that the amount of water ice that might be present on the surface of Scheila is no more than a few percent. The spectrum of the Tagish Lake chondrite matches the asteroid's spectrum at shorter wavelengths ( < 2.5μm), but no hydration features are observed at longer wavelengths on Scheila. Our prompt observations together with other studies of Scheila suggest that its observed cometary-like activity is likely not caused by the sublimation of water ice. Instead, the dust coma and tail may be results of a recent impact event.
Hsieh Henry H.
Yang Bokai
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