Inflight Calibration of the NEAR Multispectral Imager: II. Results from Eros Approach and Orbit |
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| Authors: | Scott MurchieMark Robinson Deborah DomingueHan Li Louise ProckterSEdward Hawkins III William OwenBeth Clark Noam Izenberg |
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| Institution: | a The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, 20723, f1scott.murchie@jhuapl.eduf1b Department of Geological Sciences, Northwestern University, Evanston, Illinois, 60208c The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, 20723d Jet Propulsion Laboratory, Pasadena, California, 91109e Center for Radiophysics and Space Research, Cornell University, Ithaca, New York, 14853 |
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| Abstract: | During the Near-Earth Asteroid Rendezvous (NEAR) spacecraft's investigation of asteroid 433 Eros, inflight calibration measurements from the multispectral imager (MSI) have provided refined knowledge of the camera's radiometric performance, pointing, and light-scattering characteristics. Measurements while at Eros corroborate most earlier calibration results, although there appears to be a small, gradual change in instrument dark current and flat field due to effects of aging in the space environment. The most pronounced change in instrument behavior, however, is a dramatic increase in scattered light due to contaminants accumulated on the optics during unscheduled fuel usage in December 1998. Procedures to accurately quantify and to remediate the scattered light are described in a companion paper (Li et al. 2002, Icarus155, 00-00). Acquisition of Eros measurements has clarified the relative, filter-to-filter, radiometric performance of the MSI. Absolute radiometric calibration appears very well constrained from flight measurements, with an accuracy of ∼5%. Pointing relative to the spacecraft coordinate system can be determined from the temperature of the spacecraft deck with an accuracy of ∼1 pixel. |
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| Keywords: | asteroids |
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