To coordinate with observations made by an orbiter flying repeatedly overhead, NASA's Phoenix Mars Lander is working a schedule Monday that includes staying awake all night for the first time.

Phoenix is using its weather station, stereo camera and conductivity probe to monitor changes in the lower atmosphere and ground surface at the same time NASA's Mars Reconnaissance Orbiter studies the atmosphere and ground from above.

The lander's fork-like thermal and conductivity probe was inserted into the soil Sunday for more than 24 hours of measurements coordinated with the atmosphere observations. One goal is to watch for time-of-day changes such as whether some water alters from ice phase to vapor phase and enters the atmosphere from the soil.

"We are looking for patterns of movement and phase change," said Michael Hecht, lead scientist for Phoenix's Microscopy, Electrochemistry and Conductivity Analyzer, which includes the conductivity probe. "The probe is working great. We see some changes in soil electrical properties, which may be related to water, but we're still chewing on the data."

The extended work shift for the lander began Sunday afternoon Pacific Time. In Mars time at the landing site, it lasts from the morning of Phoenix's 55th Martian day, or sol, to the afternoon of its 56th sol.

The Phoenix team's plans for Sol 56 also include commanding the lander to conduct additional testing of the techniques for collecting a sample of icy soil. When the team is confident about the collecting method, it plans to use Phoenix's robotic arm to deliver an icy sample to an oven of the Thermal and Evolved-Gas Analyzer (TEGA).

The TEGA instrument successfully opened both doors Saturday for the oven chosen to get the first icy sample. Images from the Surface Stereo Camera confirmed that the doors are wide open.

The Phoenix mission is led by Peter Smith of the University of Arizona with project management at JPL and development partnership at Lockheed Martin, 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. For more about Phoenix, visit: http://www.nasa.gov/phoenix and http://phoenix.lpl.arizona.edu.