Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.u21a0023b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #U21A-0023
Physics
5410 Composition (1060, 3672), 5420 Impact Phenomena, Cratering (6022, 8136), 5464 Remote Sensing, 5480 Volcanism (6063, 8148, 8450), 6235 Mercury
Scientific paper
During the second flyby of Mercury by the MESSENGER spacecraft (October 6, 2008), the Mercury Dual Imaging System (MDIS) will collect high-spatial-resolution broadband and lower-spatial-resolution multispectral images. The MDIS wide-angle camera (WAC) has 11 narrow-band color filters with center wavelengths in the range 430 to 1020 nm. The portion of the planet that will be illuminated by the Sun and visible to MDIS during the spacecraft's departure trajectory includes a region that was covered by Mariner 10 two-color vidicon imagery in the ultraviolet (355 nm) and orange (575 nm), which has provided color-ratio and spectral parameter images with which a number of workers have made inferences about the composition of surface units. The region of interest is the Mariner 10 first-encounter "incoming" hemisphere. Prominent features in this area include the crater Kuiper, the Rudaki plains, the Homer basin, and the craters Lermontov and Mistral. Kuiper (62-km diameter), the base of the Kuiperian time-stratigraphic system, is superimposed on the older crater Murasaki. Kuiper has an extensive bright ray network, and spectral parameter images indicate that Kuiper has excavated material that is lower in opaque content than the typical surface in the area. The Rudaki plains are low in opaque minerals compared with the surroundings that they embay and may represent a deposit of the High Reflectance Plains (HRP) described on the basis of MESSENGER flyby 1 imagery. Dark, high-opaque material is disposed along a linear ring segment of the Homer basin and may have been emplaced by pyroclastic activity. Lermontov and Mistral have high- reflectance, blue material on their floors, which may correspond to the Bright Crater Floor Deposits (BCFDs) present in the MESSENGER first-flyby departing hemisphere. The new MESSENGER data, which offers greater wavelength range in addition to improved radiometric calibration, co-registration, and signal-to-noise ratio compared with Mariner 10, will provide the opportunity to re-evaluate and extend the conclusions from the prior work.
Blewett Dave T.
Denevi Brett Wilcox
Domingue Donovan L.
Gillis-Davis Jeffery J.
Head James W.
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