Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5831h&link_type=abstract
HST Proposal ID #5831
Physics
Hst Proposal Id #5831 Solar System
Scientific paper
Neptune's atmosphere is extremely dynamic. Recently, an unprecedented change occurred in the planet's vertical aerosol structure - its northern hemisphere was seen to be brighter than its southern hemisphere for the first time since the advent of modern electronic detectors. We have HST time in Cycle 4 to observe Neptune {currently scheduled in October 1994}, and will use that time to quantify the observed changes if they still exist. We request Cycle 5 time to follow up these observations and obtain new data on Neptune. We will determine a relaxation time for changes in vertical aerosol structure by observing Neptune at the same wavelengths as we did in Cycle 4, and will provide new vertical aerosol structure by obtaining new wavelength coverage to that scheduled for Cycle 4. Specifically, we propose to obtain images of Neptune with the Planetary Camera at wavelengths from 255 to 953 Angstroms. We will model the aerosol structure by measuring both the general center-to-limb behavior as a function of latitude, and the wavelength- dependent reflectivity of discrete features. If Neptune has changed yet again, we will study the new structure. The observations will be coordinated with our regular programs of groundbased imaging, photometry, and spectroscopy. In this way, the HST data will be tied directly to ground-based Neptune imaging taken over the past 8 years and the 21-yr record of Neptune photometry from Lowell Observatory.
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