Soil Studies Continue At Site Of Phoenix Mars Lander

Phoenix's robotic arm delivered soil Thursday from a trench informally named "Rosy Red" through a narrow opening to a screen above the No. 5 oven on the lander's Thermal and Evolved-Gas Analyzer (TEGA). A few particles of the sample passed through the screen on Thursday, but not enough to fill the oven and allow analysis of the sample to begin. The Phoenix team sent commands for TEGA to vibrate the screen again on Friday, and more material reached the oven, though still not enough to proceed with analysis.

"There appear to be clumps blocking the opening," said Doug Ming of NASA Johnson Space Center, Houston, the Phoenix team's science lead on Friday. "However, we have seen in the past that when this soil sits for a while, it disperses. We intend to fill an oven with this material, either by additional vibration of the same screen or by opening doors to one of the other TEGA cells."

The conductivity measurements completed Wednesday ran from the afternoon of Phoenix's 70th Martian day, or sol, to the morning of Sol 71. A fork-like probe inserted into the soil checks how well heat and electricity move through the soil from one prong to another.

Friday's activities by the spacecraft included extending the width of an exploratory trench informally named "Neverland," which extends between two rocks on the surface of the ground.

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