|First THEMIS Infrared and Visible Images of Mars
This picture shows both a visible and a thermal infrared image taken
by the thermal emission imaging system on NASA's 2001 Mars Odyssey
spacecraft on November 2, 2001. The images were taken as part of the
ongoing calibration and testing of the camera system as the spacecraft
orbited Mars on its 13th revolution of the planet.
The visible wavelength image, shown on the right in black and white,
was obtained using one of the instrument's five visible filters. The
spacecraft was approximately 22,000 kilometers (about 13,600 miles) above
Mars looking down toward the south pole when this image was acquired.
It is late spring in the martian southern hemisphere.
The thermal infrared image, center, shows the temperature of the
surface in color. The circular feature seen in blue is the extremely cold
martian south polar carbon dioxide ice cap. The instrument has
measured a temperature of minus 120 degrees Celsius (minus184
degrees Fahrenheit) on the south polar ice cap. The polar cap is more
than 900 kilometers (540 miles) in diameter at this time.
The visible image shows additional details along the edge of the ice
cap, as well as atmospheric hazes near the cap. The view of the surface
appears hazy due to dust that still remains in the martian atmosphere
from the massive martian dust storms that have occurred over the past
The infrared image covers a length of over 6,500 kilometers
(3,900 miles) spanning the planet from limb to limb, with a resolution of
approximately 5.5 kilometers per picture element, or pixel, (3.4 miles per
pixel) at the point directly beneath the spacecraft. The visible image
has a resolution of approximately 1 kilometer per pixel (.6 miles per pixel)
and covers an area roughly the size of the states of Arizona and New
NASA's Jet Propulsion Laboratory, Pasadena, Calif. manages the 2001
Mars Odyssey mission for NASA's Office of Space Science, Washington D.C.
The thermal-emission imaging system was developed at Arizona State
University, Tempe, with Raytheon Santa Barbara Remote Sensing, Santa
Barbara, Calif. Lockheed Martin Astronautics, Denver, is the prime contractor
for the 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.
Image credit: NASA/Jet Propulsion Laboratory/Arizona State University.