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N E W S I N ..D E T A I L |
Monday, December 6, 1999 |
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Mars lander still uncommunicative PASADENA (California), Dec 5 (AP) A two-hour window of opportunity for contact with the still-silent Mars Poler Lander spacecraft opened at 4.30 am GMT, but nothing was immediately received. The spacecraft is programmed to automatically send signals using a different antenna today morning. If the second antenna works, the transmission would first be detected by the Mars Global Surveyor satellite and relayed to the Earth. Controllers say they have not exhausted all simple explanations for the silence, like a mispointed antenna or a computer reset. The spacecraft was in good shape and on course just before communications ended on Friday morning as expected before descent. However, critics say the lander may have been in trouble even before it left the launch pad 11 months ago. Attempts to detect signals from the spacecraft were to continue with a transmission window opening yesterday. It has not been heard from since Friday, when it began its fiery descent toward Mars. "We have prepared for various scenarios, and were trying all the options, said Richard Cook the spacecrafts project operations manager at NASAs Jet Propulsion Laboratory. The September 23 loss of the Landers $ 125 million sibling spacecraft have led the NASA investigators to determine that engineers failed to convert data into metrics in a critical navigation program, causing the satellite to fly far too close to Mars. Its believed to have burned up in the atmosphere it was to study. The 43-page report released on November 10 did not stop with the metric mix-up, however. It faulted navigators for taking short cuts and not knowing enough about the Lander. Investigators also reported that questions about the orbiters trajectory raised by navigators were not relayed to other groups within the project, including the spacecrafts builders at Lockheed Martin Astronautics in Colorado. The Polar Landers mission also came under unprecedented scrutiny because the same organisations and people who flew the orbiter were behind the latest mission as well. NASA Administrator Dan Goldin said on Friday the agency would stick to its approach. If the Mars Lander is lost forever, the momentum to study the planet may be diminished, said Robert Zubrin, President of the Mars Society and author of several books supporting exploration of the Red Planet. The Lander and orbiter
that were to have explored climate history and search for
water this year are part of a Red Planet campaign that
launches an orbiter and lander every 26 months, when the
orbits of Mars and Earth are properly aligned. |
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