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
Mars Polar Lander Mission StatusDecember 4, 1999
5:45 p.m. PST
Flight controllers for NASA's Mars Polar Lander have another opportunity to listen for a signal from the spacecraft beginning tonight at 8:30 p.m. PST. In a meeting late this afternoon they decided to listen for the lander during the first 30 minutes of the communications window, then they would transmit commands to the medium-gain antenna telling the spacecraft to search for Earth.
One scenario that would explain why engineers have not yet heard from the lander is that the spacecraft entered standby, or "safe mode," about 20 minutes after landing shortly after 12 noon PST Friday, Dec. 3. If the lander entered safe mode at that time, it would not be able to receive any communication until it "wakes up" this evening. It would be preprogrammed by onboard software to start looking for Earth starting at noon on Mars, or about 8:30 p.m. PST. The communication window lasts until 10:45 p.m. PST.
If contact has not been established by Sunday morning, Dec. 5, flight controllers will listen to see if the lander transmits via a UHF radio to the currently orbiting Mars Global Surveyor spacecraft. The lander would do that at about 10:50 a.m. PST Sunday if it did not receive commands from Earth telling it not to do so.
Engineers working on NASA's Deep Space 2 microprobes have additional opportunities to hear from the probes this evening at about 5:30 p.m. and 7:30 p.m. PST through the Global Surveyor relay. The probes would automatically begin to transmit at those times if their radio receivers were unable to pick up commands from Global Surveyor.
Mars Polar Lander is part of a series of missions in a long- term program of Mars exploration managed by JPL for NASA's Office of Space Science, Washington, D.C. JPL's industrial partner is Lockheed Martin Astronautics, Denver. JPL is a division of the California Institute of Technology in Pasadena.
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