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Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7489e&link_type=abstract
HST Proposal ID #7489
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Hst Proposal Id #7489 Solar System
Scientific paper
Models of Triton's atmosphere based on Voyager data and known physical processes predict a positive temperature gradient above Triton's troposphere. However, Earth-based stellar occultation probes in 1995 {Olkin et al. 1997} do not confirm this model prediction, but find the thermal gradient to be consistent with an isothermal or adiabatic profile. Data of higher signal-to-noise are needed to establish the thermal structure of Triton's middle atmosphere more accurately, as a guide to fundamental revisions of the models. Occultations of two bright stars may be visible with HST occur in 1997. We propose to observe these events {should they prove visible with HST}, using the FGS both as a high-speed photometer and in its normal role for occultation astrometry before and after each event. The HST is needed because {i} it may be the only large telescope in the occultation path and would yield thermal profiles much more accurate than any obtained previously, {ii} the FGS is the best way to examine the candidates for multiplicity prior to the events, and {iii} HST astrometry {much more accurate than ground-based astrometry} will be essential if only one chord can be observed for these events.
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