PIA16865: Secondary Concerns

Secondary Concerns


This image above shows a common pattern of secondary craters . Secondary craters are formed when blocks of material are thrown out during the formation of an impact crater. The material that impacted the surface to form these secondaries likely originated from the creation of the crater Degas .

This image was acquired as part of the NAC ride-along imaging campaign. When data volume is available and MDIS is not acquiring images for its other campaigns, high-resolution NAC images are obtained of the surface. These images are designed not to interfere with other instrument observations but take full advantage of periods during the mission when extra data volume is available.

Date acquired: November 28, 2012
Image Mission Elapsed Time (MET): 262575756
Image ID: 3038775
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 39.68°
Center Longitude: 231.8° E
Resolution: 24 meters/pixel
Scale: This image is ~27 km ( ~17 mi.) across.
Incidence Angle: 61.4°
Emission Angle: 16.6°
Phase Angle: 78.1°

Background Info:

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, MDIS acquired 88,746 images and extensive other data sets. MESSENGER is now in a year-long extended mission, during which plans call for the acquisition of more than 80,000 additional images to support MESSENGER's science goals.

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

Cataloging Keywords:

Name Value Additional Values
Target Mercury
Target Type Planet
Instrument Host MESSENGER
Host Type Orbiter
Instrument Mercury Dual Imaging System (MDIS)
Detector Narrow Angle Camera (NAC)
Extra Keywords Crater, Grayscale, Impact, Radio
Acquisition Date
Release Date 2013-03-05
Date in Caption 2012-11-28
Image Credit NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Source photojournal.jpl.nasa.gov/catalog/PIA16865
Identifier PIA16865