This image of the central peak and wall of a crater in Tyrrhena Terra, in
Mars' ancient southern highlands, was taken by the Compact Reconnaissance
Imaging Spectrometer for Mars (CRISM) at 0956 UTC (4:56 a.m. EST) on
February 8, 2008, near 4.85 degrees south latitude, 104.16 degrees east
longitude. CRISM's image was taken in 544 colors covering 0.36-3.92
micrometers, and shows features as small as 35 meters (115 feet) across.
The region covered is just over 10 kilometers (6.2 miles) wide at its
narrowest point.
This image was part of an investigation planned by students at Livonia
High School in Livonia, New York. The students are working with the CRISM
science team in a project called the Mars Exploration Student Data Teams
(MESDT), which is part of NASA's Mars Public Engagement Program and
Arizona State University's Mars Education Program. The students started
by analyzing a medium-resolution map of the area, taken as part of CRISM's
"multispectral survey" campaign to map Mars in 72 colors at 200 meters
(660 feet) per pixel. They noted multiple outcrops of clay-like minerals
called phyllosilicates in the walls and central peaks of impacts craters,
and hypothesized that the craters were excavating an extremely ancient,
buried rock layer that had been altered by liquid water. They chose this
central peak for a closer look to test their ideas, and provided its
coordinates to CRISM's operations team who took a high-resolution image of
the site. The Context Imager (CTX) accompanied CRISM with a 6 meter (20
feet) per pixel, high-resolution image to sharpen the relationship of
spectral variations to the underlying surface structures. The Livonia High
School students worked with a mentor on the CRISM team to analyze the
data, and presented their project at the 39th Lunar and Planetary Science
Conference, held in League City, Texas, on March 10-14, 2008.
The upper panel of the image shows the location of the CRISM data and the
surrounding, larger CTX image, overlain on an image mosaic taken by the
Thermal Emission Imaging System (THEMIS) on Mars Odyssey. The mosaic has
been color-coded for elevation using data from the Mars Orbiter Laser
Altimeter (MOLA) instrument on the Mars Global Surveyor (MGS) spacecraft.
Redder colors indicate higher elevations. The bottom left image shows
infrared brightness of the surface measured by CRISM at 2.5, 1.5, and 1.1
micrometers. In the lower right image, the data have been transformed into
a map of spectral features indicating the presence of different minerals.
This map emphasizes the primary igneous minerals that are present, with
reddish areas indicating olivine and blue to greenish areas indicating
pyroxene. In a different version of the mineral map, phyllosilicates can
also be seen in the crater's central peak near the upper portion of the
image.
CRISM is one of six science instruments on NASA's Mars Reconnaissance
Orbiter. Led by The Johns Hopkins University Applied Physics Laboratory,
Laurel, Md., the CRISM team includes expertise from universities,
government agencies and small businesses in the United States and abroad.
NASA's Jet Propulsion Laboratory, a division of the California Institute
of Technology in Pasadena, manages the Mars Reconnaissance Orbiter and the
Mars Science Laboratory for NASA's Science Mission Directorate,
Washington. Lockheed Martin Space Systems, Denver, built the orbiter.