First Ultraviolet Spectroscopic Survey of 2060 Chiron

Details First Ultraviolet Spectroscopic Survey of 2060 Chiron First Ultraviolet Spectroscopic Survey of 2060 Chiron

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5843s&link_type=abstract

HST Proposal ID #5843

Computer Science

Hst Proposal Id #5843 Solar System

Scientific paper

Chiron's coma has been imaged by HST, but the object has never been spectroscopically surveyed in the ultraviolet. UV spectroscopy is a powerful tool for studying the surface and atmospheric properties of comets, planetary satellites, and planets. We request time to obtain the first-ever UV survey spectrum of the highly interesting outer solar system object. These spectra will bear on critical questions concerning the nature of Chiron's surface, its coma, and perhaps the source of its activity. Specifically, we will use the FOS/BL with G270H to: {i} establish the UV albedo & color slope, {ii} quantify evidence for non-icy materials on Chiron's surface, {iii} gain a better handle on the scattering properties of the particulate coma, and {iv} search for emissions from gaseous coma species. We will obtain groundbased CCD images in conjunction with each FOS spectrum to establish the coma morphology and level of coma activity. We will combine all of these observations to provide a comprehensive picture or set of constraints on Chiron's nuclear properties, source of activity, and coma composition, which we want to compare to conventional comets. This is a critical time to conduct these observations, since Chiron will pass through its perihelion during Cycle 5. Chiron is much too faint for IUE to adequately study; the only practical approach to obtaining UV spectroscopy is HST.

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