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Архив RU.SPACE.NEWS за 26 марта 1998

Дата: 26 марта 1998 (1998-03-26) От: Alexander Bondugin Тема: STARDUST Update - March 20, 1998 Привет всем! Вот, свалилось из Internet... STARDUST Status Report March 20, 1998 Ken Atkins STARDUST Project Manager Assembly, Test, and Launch Operations (ATLO) activities: Propulsion testing was completed. The Pyro Initiator Unit (PIU) also completed testing. As noted last week, this element of the electric power subsystem triggers the various releases and deployments during the mission (e.g. Sample Return Capsule (SRC) separation from the spacecraft.) Testing of the SRC continued to go very well. The acoustic test , validating compatibility with the environmental frequencies representative of the launch vehicle, was successfully completed. The SRC was moved to the thermal vacuum test facility and the functional tests run. The flight solar array, the unit that converts sunlight to electricity for powering the Stardust spacecraft, completed its pre-ship review at Lockheed-Martin Sunnyvale. Shipment to Denver is set for March 23. More good news on the Inertial Measurement Unit (IMU ) that helps control the spacecraft's attitude in space: The leak tests were consistent with lifetime requirements. The results show good margin for the STARDUST application. Opportunity and Outreach: One of our educational outreach partners, the JASON Foundation, affiliated with Dr. Robert Ballard, the discoverer of the Titanic, began broadcasting of their annual event this week. The broadcast will run from March 16th to March 27th, and includes a segment mentioning STARDUST. The broadcast will be viewed by 1 million children and teachers from JASON's electronic satellite sites, classroom locations, or Internet connections. Special viewing for Congress, their staffers and families are to be held this Saturday, March 28, 10 am, 11:30 am, and 1 PM EST, at the National Geographic site in Washington D.C. For more information on the STARDUST mission - the first ever comet sample return mission - please visit the STARDUST home page: http://stardust.jpl.nasa.gov/ Hа сегодня все, пока! =SANA=

Дата: 26 марта 1998 (1998-03-26) От: Alexander Bondugin Тема: Galileo Update - March 25, 1998 Привет всем! Вот, свалилось из Internet... 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 Galileo Europa Mission Status March 25, 1998 NASA's Galileo spacecraft is sending to Earth the final pictures and science information stored on its onboard tape recorder during the December 1997 flyby of Jupiter's moon Europa. These data include an observation of a region on Europa with wedge-like features, which may indicate that a liquid ocean lies under the surface, and another observation of volcanic activity on Jupiter's moon Io. An observation by the photopolarimeter radiometer is part of a series designed to look for hot spots which might offer evidence that a heat source on Europa led to the creation of a liquid ocean or slush. The flight team is preparing for Galileo's next Europa flyby, scheduled for Sunday, March 29, at an altitude of about 1,645 kilometers (1,022 miles). A flight path correction was performed on Friday, March 13, and an attitude update was performed Thursday, March 19. Both events went well, even though they used the gyroscopes, the known cause of recent anomalous behavior of the attitude control system. Precautions were taken to prevent the gyroscope anomaly from affecting activities. The flight team has decided the upcoming Europa flyby will be performed without the gyros. This means there will be no way to compensate for any wobble that may be present in the spacecraft's spin axis, and instrument pointing and stability are likely to be degraded somewhat. Only very minimal effects on images taken by the spacecraft's camera are expected, with a somewhat greater impact anticipated for another instrument, the near infrared mapping spectrometer. On Thursday, March 26, Galileo will perform its final flight path correction before Sunday's Europa flyby, and the flight team will send computer commands to control all spacecraft activity during the encounter period. Regular maintenance of Galileo's onboard tape recorder will be performed Friday. Galileo's flight team is nearing completion of modifications to the attitude control system flight software that would allow the spacecraft to operate with only one gyro. Although this won't be a complete "fix," it will eliminate the need for workarounds currently being used for maneuvers and attitude updates. The recent anomalies may be caused by Galileo's long-term exposure to Jupiter's intense radiation. The spacecraft successfully completed its primary mission in December 1997 and is now in its two-year extension, the Galileo Europa Mission. The flight team will continue to monitor the radiation's impact, but current plans include five more Europa flybys, four Callisto encounters, and one or two of Io, depending on spacecraft health. ##### Hа сегодня все, пока! =SANA=

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