NASA Mars Rover team aims for landing closer to prime science site

Jun 12, 2012 By Guy Webster
This image shows changes in the target landing area for Curiosity, the rover of NASA's Mars Science Laboratory project. Credit: NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS

(Phys.org) -- NASA has narrowed the target for its most advanced Mars rover, Curiosity, which will land on the Red Planet in August. The car-sized rover will arrive closer to its ultimate destination for science operations, but also closer to the foot of a mountain slope that poses a landing hazard.

"We're trimming the distance we'll have to drive after landing by almost half," said Pete Theisinger, Mars (MSL) project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif. "That could get us to the mountain months earlier."

It was possible to adjust landing plans because of increased confidence in precision landing technology aboard the MSL spacecraft, which is carrying the rover. That spacecraft can aim closer without hitting Mount Sharp at the center of Gale crater. located in the mountain are the prime location for research with the rover.

Curiosity is scheduled to land at approximately 10:31 p.m. PDT Aug. 5 (1:31 a.m. EDT, Aug. 6). Following checkout operations, Curiosity will begin a 2-year study of whether the landing vicinity ever offered an environment favorable for .

A June 2012 revision of the landing target area for Curiosity, the big rover of NASA's Mars Science Laboratory mission, reduces the area's size. Credit: NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS

Theisinger and other mission leaders described the adjustment during a June 11 update to reporters Monday about preparations for landing and for operating Curiosity on Mars.

The landing target ellipse had been an ellipse approximately 12 miles wide and 16 miles long (20 kilometers by 25 kilometers). Continuing analysis of the new landing system's capabilities has allowed mission planners to shrink the area to approximately 4 miles wide and 12 miles long (7 kilometers by 20 kilometers), assuming winds and other as predicted.

Even with the smaller , Curiosity will be able to touch down at a safe distance from steep slopes at the edge of Mount Sharp.

"We have been preparing for years for a successful landing by Curiosity, and all signs are good," said Dave Lavery, MSL program executive. "However, landing on Mars always carries risks, so success is not guaranteed. Once on the ground we'll proceed carefully. We have plenty of time since Curiosity is not as life-limited as the approximate 90-day missions like NASA’s Mars Exploration Rovers and the Phoenix lander.”

Since the spacecraft was launched in November 2011, engineers have continued testing and improving its landing software. MSL will use an upgraded version of flight software installed on its computers during the past two weeks. Additional upgrades for Mars surface operations will be sent to the rover about a week after landing.

The ellipse is about 12 miles long and 4 miles wide (20 kilometers by 7 kilometers). Credit: NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS

Other preparations include upgrades to the rover's software and understanding effects of debris coming from the drill the rover will use to collect samples from rocks on Mars. Experiments at JPL indicate that Teflon from the drill could mix with the powdered samples. Testing will continue past landing with copies of the drill. The rover will deliver the samples to onboard instruments that can identify mineral and chemical ingredients.

"The material from the drill could complicate, but will not prevent analysis of carbon content in rocks by one of the rover's 10 instruments. There are workarounds," said John Grotzinger, MSL project scientist at the California Institute of Technology in Pasadena. "Organic carbon compounds in an environment are one prerequisite for life. We know meteorites deliver non-biological organic carbon to Mars, but not whether it persists near the surface. We will be checking for that and for other chemical and mineral clues about habitability."

Curiosity will be in good company as it nears . Two NASA orbiters along with a European Space Agency orbiter will be in position to listen to radio transmissions as MSL descends through Mars' atmosphere.

The mission is managed by JPL for NASA's Science Mission Directorate in Washington. Curiosity was designed, developed and assembled at JPL.

Explore further: Computer simulation suggests early Earth bombarded by asteroids and comets

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