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November 28,
1999: NASA's Galileo spacecraft has completed the closest-ever encounter with Jupiter's volcanic moon Io, but not before
giving ground controllers a Thanksgiving day white-knuckler.
"With so little time to spare, it would have been easy to think 'no way' can we do this," said Galileo project manager Jim Erickson. "But our team members jumped to the challenge, in some cases leaving behind half-eaten Thanksgiving dinners." "We were prepared, because we knew this high-radiation Io flyby posed a risk to spacecraft components, and in fact we saw that the radiation caused some glitches during the October 10th Io flyby," Erickson said. "This planning paid off in a big way." The team finished sending new computer commands to Galileo, which were received and executed by the spacecraft at 8:45 p.m. PST, four minutes after the closest approach to Io. This enabled the spacecraft to complete more than half of its planned observations of Io and its plasma torus (a doughnut-shaped region brimming with electrified particles), and all the planned observations of another Jovian moon, Europa. If all goes according to plan, the data will be transmitted to Earth over the next several weeks, and it will then undergo processing and analysis. The October 10th Io flyby was performed at an altitude of 611 kilometers (380 miles). Pictures and other scientific information from that flyby provided fascinating new views of Io, which has more than 100 active volcanoes. Scientists hope that by learning more about volcanic activity on Io, we may learn more about volcanoes on Earth.
Additional information about the Galileo mission is available
on the Galileo home page at a new web address of http://galileo.jpl.nasa.gov.
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