PIA19232: Riddle Me This
 Target Name:  Mercury
 Is a satellite of:  Sol (our sun)
 Mission:  MESSENGER
 Spacecraft:  MESSENGER
 Instrument:  MDIS - Narrow Angle
 Product Size:  1140 x 1141 pixels (w x h)
 Produced By:  Johns Hopkins University/APL
 Full-Res TIFF:  PIA19232.tif (1.302 MB)
 Full-Res JPEG:  PIA19232.jpg (123.9 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:

This view shows two craters in an area of smooth plains. The crater on the left presents an interesting geological puzzle. Note that about 90 of the rim (in the east, the right side) is sharp. But the remaining 270 of the circumference consists of a broad terrace, formed by slumping and inward movement of material. Why do you think that part of the rim and wall suffered slumping? Differences in the strength of the target material? (And, if so, caused by what?) The angle at which the impactor struck the surface? The topography of the surface? The presence of buried topography or structures? Local or regional tectonics? What additional data could help to solve this riddle?

This image was acquired as a targeted set of stereo images. Targeted stereo observations are acquired at resolutions much higher than that of the 200-meter/pixel stereo base map. These targets acquired with the NAC enable the detailed topography of Mercury's surface to be determined for a local area of interest.

Date acquired: January 19, 2014
Image Mission Elapsed Time (MET): 32450033
Image ID: 5600811
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 32.99
Center Longitude: 3.36 E
Resolution: 31 meters/pixel
Scale: The crater on the left is about 13 km (8 mi.) in diameter
Incidence Angle: 33.4
Emission Angle: 3.5
Phase Angle: 35.9
North is up in this image.

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:
2015-03-09