Mars Tugging on Approaching NASA Rover Curiosity

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JET PROPULSION LABORATORY
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http://www.jpl.nasa.gov

Guy Webster/D.C. Agle 818-354-5011
Jet Propulsion Laboratory, Pasadena, Calif.
Guy.webster@jpl.nasa.gov / agle@jpl.nasa.gov

Dwayne Brown/Steve Cole 202-358-1726/202-358-0918
NASA Headquarters, Washington
Dwayne.c.brown@nasa.gov / Stephen.e.cole@nasa.gov

NEWS RELEASE: 2012-227 Aug. 4, 2012

Mars Tugging on Approaching NASA Rover Curiosity

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2012-227&cid=release_2012-227

PASADENA, Calif. – The gravitational tug of Mars is now pulling NASA's car-size geochemistry
laboratory, Curiosity, in for a suspenseful landing in less than 40 hours.

"After flying more than eight months and 350 million miles since launch, the Mars Science
Laboratory spacecraft is now right on target to fly through the eye of the needle that is our target at
the top of the Mars atmosphere," said Mission Manager Arthur Amador of NASA's Jet Propulsion
Laboratory, Pasadena, Calif.

The spacecraft is healthy and on course for delivering the mission's Curiosity rover close to a Martian
mountain at 10:31 p.m. Sunday, Aug. 5 PDT (1:31 a.m. Monday, Aug. 6 EDT). That's the time a
signal confirming safe landing could reach Earth, give or take about a minute for the spacecraft's
adjustments to sense changeable atmospheric conditions.

The only way a safe-landing confirmation can arrive during that first opportunity is via a relay by
NASA's Mars Odyssey orbiter. Curiosity will not be communicating directly with Earth as it lands,
because Earth will set beneath the Martian horizon from Curiosity's perspective about two minutes
before the landing.

"We are expecting Odyssey to relay good news," said Steve Sell of the JPL engineering team that
developed and tested the mission's complicated "sky crane" landing system. "That moment has been
more than eight years in the making."

A dust storm in southern Mars being monitored by NASA's Mars Reconnaissance Orbiter appears to
be dissipating. "Mars is cooperating by providing good weather for landing," said JPL's Ashwin
Vasavada, deputy project scientist for Curiosity.

Curiosity was approaching Mars at about 8,000 mph (about 3,600 meters per second) Saturday
morning. By the time the spacecraft hits the top of Mars' atmosphere, about seven minutes before
touchdown, gravity will accelerate it to about 13,200 mph (5,900 meters per second).

NASA plans to use Curiosity to investigate whether the study area has ever offered environmental
conditions favorable for microbial life, including chemical ingredients for life.

"In the first few weeks after landing, we will be ramping up science activities gradually as we
complete a series of checkouts and we gain practice at operating this complex robot in Martian
conditions," said JPL's Richard Cook, deputy project manager for Curiosity.

The first Mars pictures expected from Curiosity are reduced-resolution fisheye black-and-white
images received either in the first few minutes after touchdown or more than two hours later. Higher
resolution and color images from other cameras could come later in the first week. Plans call for
Curiosity to deploy a directional antenna on the first day after landing and raise the camera mast on
the second day.

The big hurdle is landing. Under some possible scenarios, Curiosity could land safely, but temporary
communication difficulties could delay for hours or even days any confirmation that the rover has
survived landing.

The prime mission lasts a full Martian year, which is nearly two Earth years. During that period,
researchers plan to drive Curiosity partway up a mountain informally called Mount Sharp.
Observations from orbit have identified exposures there of clay and sulfate minerals that formed in
wet environments.

The Mars Science Laboratory is a project of NASA's Science Mission Directorate. The mission is
managed by JPL, a division of the California Institute of Technology in Pasadena. Its rover,
Curiosity, was designed, developed and assembled at JPL. Information about the mission and about
ways to participate in challenges of the landing, including a new video game, is available at:
http://www.nasa.gov/mars and http://mars.jpl.nasa.gov/msl/ .

You can follow the mission on Facebook and on Twitter at:
http://www.facebook.com/marscuriosity and http://www.twitter.com/marscuriosity .

For more information about NASA programs, visit: http://www.nasa.gov .

The California Institute of Technology in Pasadena manages JPL for NASA.

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