PIA22249: Mars Odyssey Observes Phobos

Mars Odyssey Observes Phobos


Colors in this image of the Martian moon Phobos indicate a range of surface temperatures detected by observing the moon on February 15, 2018, with the Thermal Emission Imaging System (THEMIS) camera on NASA's Mars Odyssey orbiter.

The left edge of the small moon is in darkness, and the right edge in sunlight. Phobos has an oblong shape with average diameter of about 14 miles (22 kilometers). Temperature information was derived from thermal-infrared imaging such as the grayscale image shown smaller at lower left with the moon in the same orientation. The color-coding merges information from THEMIS observations made in 10 thermal-infrared wavelength bands.

This was the second observation of Phobos by Mars Odyssey; the first was on September 29, 2017. Researchers have been using THEMIS to examine Mars since early 2002, but the maneuver turning the orbiter around to point the camera at Phobos was developed only recently.

Background Info:

THEMIS was developed by and is operated by a team based at Arizona State University, Tempe. NASA's Jet Propulsion Laboratory, Pasadena, California, manages the Mars Odyssey mission for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, built the orbiter and partners in its operation. JPL is a division of Caltech in Pasadena.

Cataloging Keywords:

Name Value Additional Values
Target Phobos Mars, Sun
System Mars
Target Type Satellite Planet, Sun
Mission 2001 Mars Odyssey
Instrument Host 2001 Mars Odyssey
Host Type Orbiter
Instrument Thermal Emission Imaging System (THEMIS)
Extra Keywords Color, Infrared
Acquisition Date
Release Date 2018-02-22
Date in Caption 2017-09-29 2018-02-15
Image Credit NASA/JPL-Caltech/ASU/SSI
Source photojournal.jpl.nasa.gov/catalog/PIA22249
Identifier PIA22249