Sunrise Near the South Pole

Today's image features a large area near the south pole of Mercury. On the right side of this image, going from top to bottom are both the Terror Rupes and Eltanin Rupes. In the middle of the right edge is Alver, a peak-ring crater. Below Alver is Disney, a crater named after the animator Walt Disney.

Date acquired: June 16, 2014
Image Mission Elapsed Time (MET): 45232494, 45232490, 45232488
Image ID: 6510119, 6510117, 6510116
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC filters: 9, 7, 6 (996, 748, 433 nanometers) in red, green, and blue
Center Latitude: -83.00°
Center Longitude: 40.17° E
Resolution: 2988 meters/pixel
Scale: This image is 1585 km (985 miles) across.
Center Incidence Angle: 85.3°
Center Emission Angle: 14.1°
Center Phase Angle: 99.4°

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

Terror Rupes

We have seen limb images of Mercury many times before, and they never fail to showcase the geological diversity (and splendor!) of the innermost planet. This time, something fills the scene with terror -- Terror Rupes, to be precise, the long, cliff-like landform visible at the center of the scene. Terror Rupes is one of Mercury's most prominent lobate scarps, and was named for HMS Terror, an eighteenth-century warship that later participated in scientific polar explorations. (For an explanation for how lobate scarps likely form, see this previous featured image.)

This image was acquired as part of MDIS's limb imaging campaign. Once per week, MDIS captures images of Mercury's limb, with an emphasis on imaging the southern hemisphere limb. These limb images provide information about Mercury's shape and complement measurements of topography made by the Mercury Laser Altimeter (MLA) of Mercury's northern hemisphere.

Date acquired: February 04, 2012
Image Mission Elapsed Time (MET): 236853865
Image ID: 1353252
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC filter: 7 (748 nanometers)
Center Latitude: -69.3°
Center Longitude: 96.0° E
Resolution: 2.7 kilometers/pixel
Incidence Angle: 80.3°
Emission Angle: 50.9°
Phase Angle: 114.5°

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

Ten Newly-Named Rupes

From the USGS Astrogeology Science Center:

The Working Group for Planetary System Nomenclature has approved new names for ten rupēs on Mercury: Alvin Rupes, Belgica Rupes, Calypso Rupes, Carnegie Rupes, Duyfken Rupes, Eltanin Rupes, Enterprise Rupes, Nautilus Rupes, Palmer Rupes, and Terror Rupes. For more information, see the Gazetteer of Planetary Nomenclature.