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Aug. 6, 1999: At the height of the baseball season, NASA is going to stretch deep into the outfield to catch bits of a falling star. But it'll be a night game, in the wee hours of Aug. 12 or 13 (next Thursday or Friday) when the Perseids meteor stream is high in the sky. The outfield is big, but the mitt and the fly balls are small, so NASA is counting on quantity and a little luck to snare one or two. Web viewers at home will get a chance to see the more impressive fireballs, glowing as if they were hot line-drives. The Perseids Live! balloon flight to about 33.5 km (110,000 ft) altitude will be NASA/Marshall's third mission to capture materials of cosmic origin before they are incinerated by entry into Earth's atmosphere or contact with the ground if they survive entry. NASA/Marshall's first two flights were in November 1998 during the Leonids meteor shower and April 1999 during a meteor minimum to provide a proper comparison. On Perseids Live!, NASA/Marshall will continue experimenting with several types of capture media to see how they fare at high altitude, and with new equipment for tracking and imagery. |
GPS - the Global Positioning System - uses timing signals from satellites in high Earth orbit to calculate the receiver's position. The 12-channel system should measure the Perseids Live! balloon's horizontal location to within 100 meters (328 feet) and its altitude to within 152 meters (500 ft). "That's within the size of a football field," Myszka said. "That's fairly good accuracy." The payload will also include a new charge-coupled device (CCD) camera, an electronic retina similar in some basic respects to the Wide Field Camera aboard the Hubble Space Telescope.
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The area-time product - 480 square centimeters for 2 hours - is comparable to that of a 1965 sounding rocket flight [a brief exposure with a larger sample area] which failed to return any detectable Leonid meteoroids. Myszka said that the balloon package probably will not travel as far as the two previous balloons did. "It will probably return to Earth closer to us," he said, "because the winds aloft have shifted as compared to the November 1998 and April 1999 launches." He anticipates landing will occur within 50 km (about 30 mi) of Redstone Arsenal where NASA/Marshall is located. |
Web Links |
NASA/Ames Leonids MAC Workshop - April 12 - 15, 1999 Leonids' Particle Analyses from Stratospheric Balloon Collection on Xerogel Surfaces - conference abstract Leonids Live! -site of the live webcast of the 1998 Leonids Related Stories: |
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