PIA18559: What a Scan!
 Target Name:  Mercury
 Is a satellite of:  Sol (our sun)
 Mission:  MESSENGER
 Spacecraft:  MESSENGER
 Instrument:  MASCS
Mercury Dual Imaging System (MDIS) 
 Product Size:  1335 x 941 pixels (w x h)
 Produced By:  Johns Hopkins University/APL
 Full-Res TIFF:  PIA18559.tif (3.77 MB)
 Full-Res JPEG:  PIA18559.jpg (260.2 kB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

Today's video is a MASCS VIRS raster scan of Lermontov in Mercury's mid latitudes. Raster scans return a large number of spectra for targeted areas of interest. This movie was created from 258 VIRS spectra, taken 1 to 5 seconds apart. The VIRS color composite has been overlain on an MDIS image of Lermontov, showing that the crater center is red and thus brighter at longer wavelengths compared to the average Mercury terrain.

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 Observed: August 8, 2013
Date Created: July 29, 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
Initial Latitude of Scan: 14.0
Initial Longitude of Scan: 310.8 E
Final Latitude of Scan: 17.8
Final Longitude of Scan: 310.0 E
Resolution: 0.25 km/pixel
Scale: Lermontov is 166 km (103 mi.) in diameter

The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System's innermost planet. During the first two years of orbital operations, MESSENGER acquired over 150,000 images and extensive other data sets. MESSENGER is capable of continuing orbital operations until early 2015.

For information regarding the use of images, see the MESSENGER image use policy.

Image Credit:
NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Image Addition Date: