Disk-resolved Spectrophotometry of the Dark Side of Iapetus

Details Disk-resolved Spectrophotometry of the Dark Side of Iapetus Disk-resolved Spectrophotometry of the Dark Side of Iapetus

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6803d&link_type=abstract

HST Proposal ID #6803

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Hst Proposal Id #6803 Solar System

Scientific paper

With this HST observation, we will obtain the first spectrum of pure dark material on Iapetus' Cassini Regio from near UV to near IR {335-1020 nm}. It will allow us to calibrate higher resolution, earth-based spectra of the leading side of Iapetus. The origin of the dark material on Iapetus is still unknown. A direct measurement of the spectrum will allow an unbiased comparison of Cassini Regio with spectra of laboratory samples and spectra of other outer solar system objects and therefore offer an additional key to the origin question. We will image the leading hemisphere of Iapetus in nine different narrow band filters. We will observe near eastern elongation and close to Saturn opposition. Under such conditions, Iapetus will have an angular diameter of about 0.23", or more than 5 PC-pixels. This is sufficient for disk-resolved spectrophotometry of Cassini Regio.

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