Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9207k&link_type=abstract
HST Proposal ID #9207
Other
Hst Proposal Id #9207 Solar System
Scientific paper
I propose to study the spectra of Pluto in the range of 2000- 2500 Angstrom that were successfully observed with HST/FOS during 34 ksec {24 orbits} total and have not been analyzed. My preliminary work with those data resulted in a mean spectrum with resolution of 10 Angstrom and S/N = 15-20 down to 2100 Angstrom. Our photochemical model for Pluto predicts the abundances of diacetylene C_4H_2 and cyanoacetylene HC_3N that may be detectable in the observed spectra. Detection of any new species on Pluto would be a breakthrough in our knowledge of that planet. The observed spectra show variations that significantly exceed the experimental uncertainties, are prominent below 2500 Angstrom, and indicate the presence of fine haze and/or rime and their variations. I will also study the spectra of Charon at 2200-3300 Angstrom that were also successfully observed with HST/FOS during 21 ksec {16 orbits} total and have not been analyzed. Averaging of these spectra results in a spectrum with resolution of 10 Angstrom and S/N >=20 above 2650 Angstrom and decreasing to 7 at 2200-2500 Angstrom. These spectra are the only data on Charon in the middle ultraviolet and may add to our knowledge of its ices and rocks. The proposal covers the successful HST observations for 55 ksec {40 orbits} that otherwise will be lost.
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