UARS Satellite expected to reenter atmosphere in 3-5 days
Forwarded from another list I'm on. Chances are slim we'll get to see it here but as they said in The Thing "Keep watching the skies". patrick Begin forwarded message:
From: "Wayne Hally" Date: 19 September 2011 04:52:32 MDT To: <meteorobs@meteorobs.org> Subject: (meteorobs) UARS Satellite expected to reenter atmosphere in 3-5 days
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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Patrick Wiggins