[meteorite-list] More on UARS reentry
From: Matson, Robert D. <ROBERT.D.MATSON_at_meteoritecentral.com>
Date: Tue, 27 Sep 2011 13:35:14 -0700 Message-ID: <9180F6B27399C541B10663E21C8BDE9202D77473_at_0461-its-exmb09.us.saic.com> Hi All, >From my message last Friday: September 24, 2011 (UT) 04:00 Just east of Somoa 146 km 04:18:30-04:20 Washington state 140 km 04:20-04:24:30 Western Canada 141-143 km . . . - - - - - So reentry would have been right around 4:00 UT. I wonder if it is possible for dense, spalled fragments (e.g. bolts) from the main break-up to survive a bit longer and show up on Doppler radar a sixth of an orbit later? The reason I ask is that over the weekend I did find some high-altitude Doppler "blips" in two radars that appear along what would have been UARS's ground track had it survived that far: Missoula, MT ------------ 4:26:20 2.5-deg 49.722N, 116.058W, 22.5 km 2.5-deg 49.431N, 116.735W, 22.5 km 4.5-deg 50.045N, 113.468W, 34.1 km 04:36:27 4.5-deg 49.584N, 116.402W, 34.0 km 04:46:34 4.5-deg 49.785N, 115.830W, 33.9 km 4.5-deg 50.013N, 113.378W, 33.8 km Great Falls, MT --------------- 04:13:03 2.5-deg 50.182N, 113.336W, 21.9 km 3.5-deg 49.277N, 114.993W, 27.8 km (outlier?) 04:44:35 3.5-deg 50.267N, 113.034W, 27.7 km 04:55:04 3.5-deg 50.384N, 112.484W, 27.8 km With the exception of the return I've labeled as an outlier, these points are fairly linear and oriented in roughly the right direction. I haven't compared the exact coordinates with the predicted ground track of UARS, but by eye they don't appear to be too far off. That said, the returns could just be noise that just happens to be in about the right location. I would need to check data from several preceding hours to see if similar noise blips appear. --Rob -----Original Message----- From: meteorite-list-bounces at meteoritecentral.com [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Sterling K. Webb Sent: Tuesday, September 27, 2011 1:14 PM To: Meteorite List Cc: Marco Langbroek Subject: Re: [meteorite-list] UARS -- Alberta or Pacific fall? NASA releases location of UARS re-entry: http://www.nasa.gov/mission_pages/uars/index.html Far from Alberta: 14.1 South and 170.2 W., in the vicinity of Samoa, above Pago-Pago, American Samoa, actually. Sterling K. Webb Received on Tue 27 Sep 2011 04:35:14 PM PDT |
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