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Three spacecraft orbiting Mars are preparing for the arrival of the UA's Mars Phoenix lander, positioning themselves to monitor the new arrival as it approaches the atmosphere on May 25.

NASA's Mars Odyssey and Mars Reconnaissance Orbiter and the European Space Agency's Mars Express are all adjusting their orbits to track Phoenix as it reaches the Martian surface and relay data.

"We will have diagnostic information from the top of the atmosphere to the ground that will give us insight into the landing sequence," said David Spencer of NASA's Jet Propulsion Laboratory in Pasadena, Calif., in a statement detailing the orbiters' planned maneuvers.

Odyssey will turn its ultrahigh-frequency to record the Phoenix during descent, immediately relaying the information to Earth. The Mars Reconnaissance Orbiter and Mars Express will be in position to back up the Odyssey, capturing transmissions from Phoenix as it closes the nine-month journey to the red planet.

The Phoenix mission, led by the University of Arizona's Peter Smith, will hit the Martian atmosphere at 12,750 mph, and, in the span of seven minutes, slow to 5.4 mph as it prepares to land, using a combination of heat-shield friction, a parachute and descent rockets. The craft will touch down in the northern polar region and begin investigating for subsurface ice.