Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9035k&link_type=abstract
HST Proposal ID #9035
Computer Science
Hst Proposal Id #9035 Solar System
Scientific paper
We propose to use STIS to obtain data cubes for Uranus {Cycle 10} and Neptune {Cycle 11}. The spectrum between 290 and 1020 nm is sampled at 2000 wavelengths. The north-south position on the planetary disk is sampled along the slit every 0.05". The east-west position is sampled by successive exposures every 0.05" {longward of 520 nm wavelength} and 0.15" {shortward of 520 nm}. Such data have never been obtained. Only HST, with STIS, has the capability to record spatial variations of narrow methane and hydrogen absorption and Raman scattering features. We have obtained such data for Saturn by ground-based observations which permitted a comprehensive understanding of the vertical haze and cloud structure as a function of latitude. Similar improvements are expected from the proposed data for Uranus and Neptune. HST has revealed exciting images of Uranus and Neptune while their quantitative analysis has been slow due to limitations in available filters. Our short, spatially-resolved spectroscopic program will reveal accurate spectral shapes across each WFPC2 filter which then will greatly improve the reliability of interpretations based on hundreds of past and future WFPC2 images. Similarly, WFPC2 images of Titan required the addition of STIS spectra before the latest improvements in our understanding of its atmosphere were possible.
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