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Proceedings Paper

Stellar occultation experiment with the CASSINI VIMS instrument
Author(s): Marc Walch; David W. Juergens; Steve Anthony; Philip D. Nicholson
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Paper Abstract

The VIMS instrument (Visible and Infrared Mapping Spectrometer) will be flown in the late 1990s on the CASSINI mission to Saturn and its moons. VIMS is designed to generate two-dimensional multispectral images of planetary surfaces and their features in the visible and infrared spectra. Compared to earth-based instruments, the stellar occultation experiment will provide unprecedented thickness resolution and chemical composition of planetary atmospheres. It will also gather high SNR optical depth profiles and particle size distribution of the Saturnian rings. The stellar occultation mode ideally requires continuous data acquisition for periods of up to several hours as the instrument stares at a star. This presents a sizeable challenge to the instrument's operational mode: processes that normally occur during mirror retrace must be shifted to data acquisition cycles, thereby creating timing difficulties in the sequencing of these cycles. The presentation focuses on the analysis of the stellar occultation mode and presents solutions to the challenge of an uninterrupted data stream. Several options will be presented that minimize any possible degradation of the experiment's science content.

Paper Details

Date Published: 5 January 1993
PDF: 12 pages
Proc. SPIE 1762, Infrared Technology XVIII, (5 January 1993); doi: 10.1117/12.138989
Show Author Affiliations
Marc Walch, Jet Propulsion Lab. (United States)
David W. Juergens, Jet Propulsion Lab. (United States)
Steve Anthony, Jet Propulsion Lab. (United States)
Philip D. Nicholson, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 1762:
Infrared Technology XVIII
Bjorn F. Andresen; Freeman D. Shepherd, Editor(s)

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