Physics – Optics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p33a..03m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P33A-03
Physics
Optics
5405 Atmospheres (0343, 1060), 5415 Erosion And Weathering, 5419 Hydrology And Fluvial Processes, 5420 Impact Phenomena, Cratering (6022, 8136), 6225 Mars
Scientific paper
The Mars Color Imager (MARCI) on MRO is a copy of the wide angle instrument flown on the unsuccessful Mars Climate Orbiter. It consists of two optical systems (visible and ultraviolet) projecting images onto a single CCD detector. The field of view of the optics is 180 degrees cross-track, sufficient to image limb-to-limb even when the MRO spacecraft is pointing off-nadir by 20 degrees. MARCI can image in two UV (260 and 320 ±15 nm) and five visible (425, 550, 600, 650, and 750 nm, ±25 nm) channels. The visible channels have a nadir scale of about 900 m, and a limb scale of just under 5 km; the UV channels are summed to 7-8 km nadir scale. Daily global observations, consisting of 12 terminator to terminator, limb-to-limb swaths are used to monitor meteorological conditions, clouds, dust storms, and ozone concentration (a surrogate for water). During high data rate periods, MARCI can reproduce the Mariner 9 global image mosaic every day. The Context Camera (CTX) acquires 30 km wide, 6 m/pixel images, and is new camera derived from the MCO medium angle MARCI. Its primary purpose is to provide spatial context for MRO instruments with higher resolution, or more limited fields of view. Scientifically, CTX acquires images that are nearly as high in spatial resolution as the Mars Orbiter Camera aboard MGS. CTX can cover about 9 percent of Mars, but stereoscopic coverage, overlap for mosaics, and re-imaging locations to search for changes will reduce this coverage significantly.
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