NOAO >   Observing Info >   Approved Programs >   2008B-0137

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Proposal Information for 2008B-0137


PI: Bin Yang, Univ. of Hawaii, yangbin@ifa.hawaii.edu
Address: Institute for Astronomy, 2680 Woodlawn Dr., honolulu, Hawaii 96822, USA

CoI: David Jewitt, Institute for Astronomy, Univ. of Hawaii

Title: U-band Photometry of an Unusual Trojan Family

Abstract: It is widely believed that the Jovian Trojans are exclusively red bodies and their spectra are generally classified as P- and D-types. However, a Trojan family (the Eurybates family) was recently found to show unusual neutral colors in the optical. About 60% of family members show flat and featureless spectra, which are classified as C- types. Although Trojan asteroids are thought to be water rich, all published studies failed to detect any sign of the presence of water. Eurybates family members with flat spectra, may contain an important record of possible aqueous alteration, which can be investigated in the ultraviolet (UV). Unfortunately, available data on this family are limited to longward of 5000A and are not sufficient to be examined in the UV region. We propose to obtain U-band photometry on Eurybates Trojans to search for evidence of the presence of hydrated minerals.


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