PIA19131: Cratered Summit of a Knob


Cratered Summit of a Knob

Caption:

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Map Projected Browse Image
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There are many knob formations is the southeastern Acidalia region of Mars. All show a hilltop crest except one which has a summit crater that resembles a cone volcano.

Knobs like these likely formed from interactions between water ice and lava. For instance, the crater at the top of the center knob is likely from a steam explosion when lava vaporized ice. As such, this summit crater is not an impact crater.

This caption is based on a public target suggestion from HiWish .

Background Info:

HiRISE is one of six instruments on NASA's Mars Reconnaissance Orbiter. The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.

Cataloging Keywords:

Name Value Additional Values
Target Mars
System
Target Type Planet
Mission Mars Reconnaissance Orbiter (MRO)
Instrument Host Mars Reconnaissance Orbiter
Host Type Orbiter
Instrument High Resolution Imaging Science Experiment (HiRISE)
Detector
Extra Keywords Crater, Grayscale, Impact, Map, Volcano, Water
Acquisition Date
Release Date 2015-01-15
Date in Caption
Image Credit NASA/JPL-Caltech/University of Arizona
Source photojournal.jpl.nasa.gov/catalog/PIA19131
Identifier PIA19131