Rest In Peace Uars |
Rest In Peace Uars |
Dec 14 2005, 11:51 PM
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Member Group: Members Posts: 183 Joined: 22-October 05 From: Cape Canaveral, FL Member No.: 534 |
The Upper Atmospheric Research Satellite, deployed Sept. 12 1991 from the Space Shuttle Discovery, was decomissioned today. It's last good battery shorted out in August and planning to end the mission went as planned and concluded today with the shutting down of the satellite. Last week, a several-minute burn lowered the orbit of the satellite.
It is expected to make an uncontrolled reentry in 2008 or 2009. UARS opened a wealth of understanding on the upper and lower atmospheric layers including monitoring the ozone layer. -------------------- |
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Sep 19 2011, 11:25 AM
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Junior Member Group: Members Posts: 30 Joined: 5-September 07 From: High Bridge, New Jersey, USA Member No.: 3669 |
Prepare for UFO and fireball reports!
This will be an uncontrolled reentry, so could occur anywhere from 57 degrees N to 57 degrees South latitude. Latest estimate is Sept 23 +/- 1 day The risk assessment is interesting reading: http://www.nasa.gov/pdf/585584main_UARS_Status.pdf Total dry mass at start 5668 kg – Number of potentially hazardous objects expected to survive: 26 – Total mass of objects expected to survive: 532 kg – Estimated human casualty risk (updated to 2011): ~ 1 in 3200 • No NASA or USG human casualty reentry risk limits existed when UARS was designed, built, and launched. • NASA, the USG, and some foreign space agencies now seek to limit human casualty risks from reentering space objects to less than 1 in 10,000. • UARS is a moderate-sized space object. Uncontrolled reentries of objects more massive than UARS are not frequent, but neither are they unusual. – Combined Dragon mockup and Falcon 9 second stage reentry in June 2010 was more massive. • Since the beginning of the space age, there has been no confirmed report of an injury resulting from reentering space objects. • NASA, DoD, and the IADC will be monitoring the decay and reentry of UARS carefully. |
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