Home Mission Overview Mission Overview Mission Objectives News News & Features Media Room Multimedia Multimedia Images 3D Images Videos Animation Media Telecons - Audio Podcasts
› Larger image A rock informally named "Headless," on the north side of NASA's Phoenix Mars Lander, has been selected for an attempt to slide the rock aside with the lander's robotic arm. Image credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University Full image and caption   Latest press images 3D images Raw images Latest videos JPL Phoenix site NASA Phoenix site Univ. of Arizona Phoenix site Tools: › Print this article › Join e-mail list NASA's Phoenix Lander Might Peek Under a Rock September 22, 2008 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 be 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 Media contacts: 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 2008-177 › News releases archives		› NASA Phoenix site › University of Arizona Phoenix site › JPL on Facebook and Twitter › Landing Press Kit (3Mb - PDF) › Launch Press Kit (6.5Mb - PDF) › Mission Fact Sheet (244Kb - PDF) › NASA Mars Exploration site › NASA/JPL Landing Blog › Mars Exploration Rovers › JPL's Rover News and Image › Mars Reconnaissance Orbiter › Mars Odyssey › Mars Express
PRIVACY     |    FAQ     |     FEEDBACK Site Manager: Susan Watanabe Webmasters: Tony Greicius, Martin Perez