Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

ASU instrument takes better look at Mars minerals

24.06.2009
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.

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."

Robert Burnham, robert.burnham@asu.edu
480-458-8207
School of Earth and Space Exploration

Robert Burnham | EurekAlert!
Further information:
http://www.asu.edu

More articles from Physics and Astronomy:

nachricht ASU astrophysicist helps discover that ultrahot planets have starlike atmospheres
13.08.2018 | Arizona State University

nachricht UT-ORNL team makes first particle accelerator beam measurement in six dimensions
13.08.2018 | DOE/Oak Ridge National Laboratory

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

Im Focus: The “TRiC” to folding actin

Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.

Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...

Im Focus: Lining up surprising behaviors of superconductor with one of the world's strongest magnets

Scientists have discovered that the electrical resistance of a copper-oxide compound depends on the magnetic field in a very unusual way -- a finding that could help direct the search for materials that can perfectly conduct electricity at room temperatur

What happens when really powerful magnets--capable of producing magnetic fields nearly two million times stronger than Earth's--are applied to materials that...

Im Focus: World record: Fastest 3-D tomographic images at BESSY II

The quality of materials often depends on the manufacturing process. In casting and welding, for example, the rate at which melts solidify and the resulting microstructure of the alloy is important. With metallic foams as well, it depends on exactly how the foaming process takes place. To understand these processes fully requires fast sensing capability. The fastest 3D tomographic images to date have now been achieved at the BESSY II X-ray source operated by the Helmholtz-Zentrum Berlin.

Dr. Francisco Garcia-Moreno and his team have designed a turntable that rotates ultra-stably about its axis at a constant rotational speed. This really depends...

Im Focus: A molecular switch may serve as new target point for cancer and diabetes therapies

If certain signaling cascades are misregulated, diseases like cancer, obesity and diabetes may occur. A mechanism recently discovered by scientists at the Leibniz- Forschungsinstitut für Molekulare Pharmakologie (FMP) in Berlin and at the University of Geneva has a crucial influence on such signaling cascades and may be an important key for the future development of therapies against these diseases. The results of the study have just been published in the prestigious scientific journal 'Molecular Cell'.

Cell growth and cell differentiation as well as the release and efficacy of hormones such as insulin depend on the presence of lipids. Lipids are small...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

2018 Work Research Conference

25.07.2018 | Event News

 
Latest News

Can radar replace stethoscopes?

14.08.2018 | Medical Engineering

The end-Cretaceous extinction unleashed modern shark diversity

14.08.2018 | Life Sciences

Light-controlled molecules: Scientists develop new recycling strategy

14.08.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>