The top image is a MASCS VIRS color composite of Rembrandt, Mercury's second largest impact basin. The bottom image is a MDIS color mosaic of the same area. Rembrandt's rim appears blue in both images, indicating low reflectance relative to its center in the VIRS image. Some small, fresh craters appear in yellow and are highly reflective in VIRS.
The VIRS composite shows hundreds of individual footprints tracks (minimum 100-200 m across and 3-4 km long) taken from different directions and altitudes. In locations where multiple footprints cover the same area, the footprint with the best illumination for mineralogical interpretation (usually the lowest incidence angle where shadows are minimized) is used for making the map.
Date Created: July 27, 2014
Instruments: Visible and Infrared Spectrograph (VIRS) of the Mercury Atmosphere and Surface Composition Spectrometer (MASCS) and Mercury Dual Imaging System (MDIS)
VIRS Color Composite Wavelengths: 575 nm as red, 415 nm/750 nm as green, 310 nm/390 nm as blue
MDIS Color Wavelengths: 1000nm as red, 750nm as green, 430 as blue
Center Latitude: -34.3°
Center Longitude: 87.2° E
Resolution: 1 km/pixel
Scale: Rembrandt is 715 km (444 mi.) in diameter
Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
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