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This VIS image shows an unnamed crater located in Terra Sirenum. The surface of the ejecta contains radial grooves, visible on the thicker ejecta near the crater rim. The formation mechanism for the grooves is still unknown but several theories exist including basal surge flows and air pressure rock entrainment. Several gullies dissect the inner crater rim.

Orbit Number: 84865 Latitude: -43.7455 Longitude: 222.519 Instrument: VIS Captured: 2021-01-31 01:32

Please see the THEMIS Data Citation Note for details on crediting THEMIS images.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Science Mission Directorate, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.