NASA's Phoenix Lander Might Peek Under a Rock

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 TELEPHONE 818-354-5011
http://www.jpl.nasa.gov

Guy Webster 818-354-6278
Jet Propulsion Laboratory, Pasadena, Calif.
guy.webster@jpl.nasa.gov

Dwayne Brown 202-358-1726
NASA Headquarters, Washington
dwayne.c.brown@nasa.gov

Sara Hammond 520-626-1974
University of Arizona, Tucson
shammond@lpl.arizona.edu

NEWS RELEASE: 2008-177 September 22, 2008

NASA's Phoenix Lander Might Peek Under a Rock

TUCSON, Ariz. -- If the robotic arm on NASA's Phoenix Mars Lander can nudge a rock
aside today, scientists on the Phoenix team would like to see what's underneath.

Engineers who develop commands for the robotic arm have prepared a plan to try
displacing a rock on the north side of the lander. This rock, roughly the size and shape of
a VHS videotape, is informally named "Headless."

"We don't know whether we can do this until we try," said Ashitey Trebi Ollennu, a
robotics engineer at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "The idea is to
move the rock with minimum disturbance to the surface beneath it. You have to get under
it enough to lift it as you push it and it doesn't just slip off the scoop."

The lander receives commands for the whole day in the morning, so there's no way to
adjust in mid-move if the rock starts slipping. Phoenix took stereo-pair images of
Headless to provide a detailed three-dimensional map of it for planning the arm's
motions. On Saturday, Sept. 20, the arm enlarged a trench close to Headless. Commands
sent to Phoenix Sunday evening, Sept. 21, included a sequence of arm motions for today,
intended to slide the rock into the trench.

Moving rocks is not among the many tasks Phoenix's robotic arm was designed to do. If
the technique works, the move would expose enough area for digging into the soil that
had been beneath Headless.

"The appeal of studying what's underneath is so strong we have to give this a try," said
Michael Mellon, a Phoenix science team member at the University of Colorado, Boulder.

The scientific motive is related to a hard, icy layer found beneath the surface in trenches
that the robotic arm has dug near the lander. Excavating down to that hard layer
underneath a rock might provide clues about processes affecting the ice.

"The rocks are darker than the material around them, and they hold heat," Mellon said.
"In theory, the ice table should deflect downward under each rock. If we checked and saw
this deflection, that would be evidence the ice is probably in equilibrium with the water
vapor in the atmosphere."

An alternative possibility, if the icy layer were found closer to the surface under a rock,
could by the rock collecting moisture from the atmosphere, with the moisture becoming
part of the icy layer.

The Phoenix mission is led by Smith at the University of Arizona with project
management at NASA's Jet Propulsion Laboratory in Pasadena, Calif., and development
partnership at Lockheed Martin in Denver. International contributions come from the
Canadian Space Agency; the University of Neuchatel, Switzerland; the universities of
Copenhagen and Aarhus in Denmark; the Max Planck Institute in Germany; and the
Finnish Meteorological Institute.

For more about Phoenix, visit: http://www.nasa.gov/phoenix or
http://phoenix.lpl.arizona.edu.

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