Featured Research

from universities, journals, and other organizations

Better Looks At Mars Minerals For Instrument On NASA's Mars Odyssey Orbiter

Date:
July 10, 2009
Source:
Arizona State University
Summary:
A new orbit at an earlier time of day is increasing the sensitivity and efficiency of ASU's THEMIS multi-band camera on NASA's Mars Odyssey spacecraft.

Pastel colors swirl across Mars, revealing differences in the composition and nature of the surface in this recently taken false-color infrared THEMIS image. Showing an area 31.9 kilometers (19.8 miles) by 88.3 kilometers (54.9 miles) in the southern highlands of Mars, the image is a result of the earlier orbit time for Mars Odyssey and THEMIS. In the image, dark areas mark exposures of relatively cold ground with abundant bare rock, while warmer basaltic sand covers the light blue-green regions. Reddish areas likely have a higher silica content, due either to a different volcanic composition or to weathering.
Credit: Copyright Arizona Board of Regents

A slow drift in the orbit of NASA's Mars Odyssey spacecraft that mission controllers started nine months ago is now giving an ASU instrument on the spacecraft a better and more sensitive view of minerals on the surface of Mars. The instrument is the Thermal Emission Imaging System (THEMIS), an infrared and visual camera operated by ASU's Mars Space Flight Facility.

Related Articles


The maneuver to change Odyssey's orbit began Sept. 30, 2008, and ended June 9, 2009, with a five-and-a-half-minute thruster firing. The rocket burn fixed the spacecraft's track so that THEMIS looks down on the planet at an earlier time of day, 3:45 in the afternoon instead of 5 p.m.

Odyssey's two-hour orbit is synchronized with the Sun, so that the local solar time on the ground remains the same whatever part of Mars the spacecraft is flying over. As Odyssey travels on its north-to-south leg over the day side, the local time below the spacecraft is now 3:45 pm; similarly, the local time is 3:45 a.m. under the spacecraft as it flies the south-to-north leg of each orbit on the night side.

Warmer ground means better data

"The new orbit means we can now get the type of high-quality data for the rest of Mars that we got for 10 or 20 percent of the planet during the early months of the mission," says Philip Christensen of ASU's School of Earth and Space Exploration, part of the College of Liberal Arts and Sciences. Christensen designed THEMIS and is the instrument's principal investigator.

One important finding based on early-mission THEMIS data was the discovery of chloride mineral deposits in the ancient southern highlands. These salt beds are possible relics of a warmer and wetter epoch on Mars and may have something to tell scientists about a Martian biosphere, past or present.

"Imaging Mars earlier in the afternoon means that THEMIS sees a warmer surface," explains Christensen. "And this makes a greater temperature difference with the nighttime measurements. The stronger contrast brings out more clearly the composition variations in the surface rocks."

In another operational change, Odyssey has begun in recent weeks to make observations other than straight downward-looking. This more-flexible targeting allows THEMIS to image some latitudes near the poles that never pass directly underneath the orbiter. In addition, the sideways views let THEMIS fill in more quickly gaps in coverage left by previous imaging, and they will also permit stereoscopic, three-dimensional images.

"At visual wavelengths, THEMIS has photographed about half the Martian surface," says Christensen. "We're really looking forward to filling the holes in the coverage."


Story Source:

The above story is based on materials provided by Arizona State University. Note: Materials may be edited for content and length.


Cite This Page:

Arizona State University. "Better Looks At Mars Minerals For Instrument On NASA's Mars Odyssey Orbiter." ScienceDaily. ScienceDaily, 10 July 2009. <www.sciencedaily.com/releases/2009/06/090622171516.htm>.
Arizona State University. (2009, July 10). Better Looks At Mars Minerals For Instrument On NASA's Mars Odyssey Orbiter. ScienceDaily. Retrieved December 19, 2014 from www.sciencedaily.com/releases/2009/06/090622171516.htm
Arizona State University. "Better Looks At Mars Minerals For Instrument On NASA's Mars Odyssey Orbiter." ScienceDaily. www.sciencedaily.com/releases/2009/06/090622171516.htm (accessed December 19, 2014).

Share This


More From ScienceDaily



More Space & Time News

Friday, December 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Rover Finds More Clues About Possible Life On Mars

Rover Finds More Clues About Possible Life On Mars

Newsy (Dec. 17, 2014) NASA's Curiosity rover detected methane on Mars and organic compounds on the surface, but it doesn't quite prove there was life ... yet. Video provided by Newsy
Powered by NewsLook.com
Evidence of Life on Mars? NASA Rover Finds Methane, Organic Chemicals

Evidence of Life on Mars? NASA Rover Finds Methane, Organic Chemicals

Reuters - US Online Video (Dec. 16, 2014) NASA's Mars Curiosity rover finds methane in the Martian atmosphere and organic chemicals in the planet's soil, the latest hint that Mars was once suitable for microbial life. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Geminids Meteor Shower Lights Up Skies in China

Geminids Meteor Shower Lights Up Skies in China

AFP (Dec. 16, 2014) The Geminids meteor shower lights up the skies over the Changbai Mountains in northeast China. Duration: 01:03 Video provided by AFP
Powered by NewsLook.com
Raw: Defense Satellite Launches from California

Raw: Defense Satellite Launches from California

AP (Dec. 13, 2014) A U.S. defense satellite launched from California's central coast on Friday after weather delays caused by a major storm that drenched the state. (Dec. 13) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins