NASA MAKES CONTACT WITH PATHFINDER AFTER DAYS WITHOUT A PEEP FROM MARS.Byline: Associated Press Associated Press: see news agency. Associated Press (AP) Cooperative news agency, the oldest and largest in the U.S. and long the largest in the world. After three days of problems communicating with the Mars Pathfinder, controllers were able to re-establish enough contact with the lander through an auxiliary transmitter to determine it's still operational, NASA NASA: see National Aeronautics and Space Administration. NASA in full National Aeronautics and Space Administration Independent U.S. said Wednesday. Successfully commanding Pathfinder to send a beacon signal was a good sign, said Project Manager Brian Muirhead at the National Aeronautics and Space Administration's Jet Propulsion Laboratory “JPL” redirects here. For other uses, see JPL (disambiguation). Jet Propulsion Laboratory (JPL) is a NASA research center located in the cities of Pasadena and La Cañada Flintridge, near Los Angeles, California, USA. . However, he likened the level of contact to the spacecraft ``waving'' at Earth rather than talking. The possibility that the problem could effectively end the mission was ``very remote,'' he said. ``We're suspicious that the spacecraft is in a new mode because of the battery aging,'' Muirhead said. If the batteries have failed and only solar energy solar energy, any form of energy radiated by the sun, including light, radio waves, and X rays, although the term usually refers to the visible light of the sun. is available, controllers will have to figure out new ways to manage Pathfinder. A brief communication session Tuesday night marked the first time the Pathfinder's engineers and scientists heard from the spacecraft since downloading data in a session that ended at 3:23 a.m. PDT PDT abbr. Pacific Daylight Time PDT Pacific Daylight Time PDT n abbr (US) (= Pacific Daylight Time) → hora de verano del Pacífico PDT Saturday, on the 83rd day of the mission. When they tried again late Saturday, on Day 84, they could not get a signal from the lander. At the time, they thought the problem might be due to a computer reset, a problem on the ground or low voltage Low voltage is an electrical engineering term that broadly identifies safety considerations of an electricity supply system based on the voltage used. While different definitions exist for the exact voltage range covered by "low voltage", the most commonly used ones include "mains . A reset or low voltage because of battery problems would keep the spacecraft from talking to Earth. Continued attempts to make contact failed until they heard from the spacecraft through its auxiliary transmitter Tuesday night. The Pathfinder team at JPL (language) JPL - JAM Programming Language. planned to use the lander's auxiliary transmitter again Wednesday night to get engineering data that could help pinpoint the source of the problem. Muirhead noted that batteries are constant-voltage devices, while solar arrays are not. If the batteries have finally failed, managing the spacecraft will require determining when the solar arrays are producing enough energy to support Pathfinder's electrical loads. While the lander remains largely silent, the foot-high Sojourner rover has been taking its cues from an on-board contingency program that told it to stay put and not begin a planned trip around the lander. If it doesn't get instructions from the lander after five more days, the rover will assume the lander is busy and begin exploring on its own. |
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