UV Spectroscopic Investigation of any Bright, Newly Discovered Comet

Details UV Spectroscopic Investigation of any Bright, Newly Discovered Comet UV Spectroscopic Investigation of any Bright, Newly Discovered Comet

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8276w&link_type=abstract

HST Proposal ID #8276

Computer Science

Hst Proposal Id #8276 Solar System

Scientific paper

We propose aTarget of Opportunity program to investigate any bright comet {V<=6} that is newly discovered during Cycle 8, including comets of any dynamical class. Our main scientific objective is to obtain accurate abundance measurements for all known UV-emitting cometary species {CO from the CO 4PG bands, CO2 from the CO Cameron bands, S2 from the S2 B-X bands, CS2 from CS emissions, and water from OH emissions} and to perform a deep search for any previously undetected species. The long slit capability of STIS will allow us to characterize the spatial distribution of the coma species, so that we can identify those derived from an extended source {e.g. CO}, study the decay of short-lived species {e.g. S2}, and investigate the importance of e-impact on CO for the excitation of the Cameron bands. The latter issue can be definitively resolved during high spectral resolution observations of any comet having V<=5. If an exceptionally bright {V<=2} comet is discovered, we would then request Director's Discretionary time to measure the D/H ratio. This program is a continuation of our efforts in previous cycles to observe as many comets as possible with HST for the purpose of doing abundance intercomparisons on a statistically meaningful sample of objects.

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