A Youthful Crater and Its Ejecta
NASA/JPL/UArizona
A Youthful Crater and Its Ejecta
ESP_026099_2320  Science Theme: Impact Processes
In this image, we can clearly see the ejecta of this crater, and that tells us the crater appears young and well-preserved. "Ejecta" refers to the material that is excavated from an initial impact and settles back to the surface.

One way we describe a crater as being young is to observe the crater rim. If the rim of a crater doesn't appear that eroded, we often call it "sharp" and "young," even though the impact may have occurred an extremely long time ago.

Given the latitude and proximity to gullies on mesas and massifs in this region, there could also be mid-latitude-type gullies in this crater. At HiRISE resolution, we can get a better look at the ejecta, its distribution and possibly characterize any subsequent modifications we can see in the crater walls.



Written by: HiRISE Science Team (audio by Tre Gibbs)  (1 April 2012)

This is a stereo pair with ESP_027866_2320.
 
Acquisition date
20 February 2012

Local Mars time
14:53

Latitude (centered)
51.633°

Longitude (East)
333.025°

Spacecraft altitude
307.9 km (191.4 miles)

Original image scale range
30.8 cm/pixel (with 1 x 1 binning) so objects ~92 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
1.8°

Phase angle
41.5°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
72.9°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  342.0°
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NASA/JPL/UArizona

POSTSCRIPT
NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.