June 01, 2012
Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
The field of view of each frame is approx. 350 km (220 mi.) across
Both images show the same portion of Tir Planitia, a region of smooth plains
near Mercury's equator. The image on the left is part of the MDIS global surface morphology basemap
, whereas the image on the right is part of the MDIS high-incidence-angle base map.
The high-incidence-angle base map is a major mapping activity in MESSENGER's extended mission and complements the surface morphology base map of MESSENGER's primary mission, which was acquired under generally more moderate incidence angles. High incidence angles, achieved when the Sun is near the horizon, result in long shadows that accentuate the small-scale topography of geologic features. Therefore, landforms such as wrinkle ridges
that may not be readily visible in the surface morphology basemap (yellow arrows) become more apparent with high-incidence-angle lighting (red arrows). The high-incidence-angle base map is being acquired with an average resolution of 200 meters/pixel.
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. Visit the Why Mercury?
section of this website to learn more about the key science questions that the MESSENGER mission is addressing. During the one-year primary mission, MESSENGER acquired 88,746 images and extensive other data sets. MESSENGER is now in a yearlong extended mission, during which plans call for the acquisition of more than 80,000 additional images to support MESSENGER's science goals.
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
For information regarding the use of MESSENGER images, see the image use policy.