The scarp cutting through this crater was imaged as MESSENGER approached
the planet during the mission's second Mercury flyby. The full
NAC image acquired by MDIS is shown in a previous release (PIA11772) while the image
shown here is a reprojected view. Compare the two images to see the
differences.
By using very precise knowledge about the time that the image was taken
and the location of the spacecraft at that time, the original image can be
mapped onto a globe of Mercury. Once mapped onto a Mercury globe, that
globe can be viewed in many different ways, including reprojections that
create flat maps of Mercury's surface, as seen in this global map of
Mercury (PIA11403). The reprojected image shown here is from a simple cylindrical map
projection. Map projections are needed to measure accurately the extent of
features on the surface. For example, from this reprojection it was
determined that this scarp is about 1 kilometer (0.6 miles) high and over
160 kilometers (100 miles) in length. MESSENGER Science Team members
recently published an image similar to this reprojection in Science
magazine.
Date Acquired: October 6, 2008
Image Mission Elapsed Time (MET): 131766501
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 420 meters/pixel (0.26 miles)
Scale: This crater is about 200 kilometers (124 miles) in diameter
Spacecraft Altitude: 16,300 kilometers (10,100 miles)
These images are from MESSENGER, a NASA Discovery mission to conduct the
first orbital study of the innermost planet, Mercury. For information
regarding the use of images, see the MESSENGER image use policy.