Decay watch: Apr 1 (Ir 11A S/D down)

Alan Pickup (alan@wingar.demon.co.uk)
Thu, 1 Apr 1999 22:35:25 +0100

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Object: #25580 = 98- 74 D = Iridium 11A Smart Dispenser

Decay predictions:
Source   Prediction made    Predicted decay at      Latitude Longitude
               UTC                UTC                  deg      deg

SpaceCom   Mar 23 10:26     Apr  2 10:53 +-6d        50.3 S    25.0 W
SpaceCom   Mar 25 22:20     Apr  1 20:34 +-4d         5.8 S     5.8 E
SpaceCom   Mar 29 04:21     Apr  2 02:50 +-2d        78.2 N    70.0 W
SpaceCom   Mar 30 00:40     Apr  1 19:21 +-2d        51.7 N    29.2 E
SpaceCom   Mar 30 18:18     Apr  1 15:55 +-1d        70.1 S    65.9 E
SpaceCom   Mar 31 14:55     Apr  1 14:19 +-14h       75.2 S    65.2 W
SpaceCom   Apr  1 02:13     Apr  1 14:34 +-8h        40.6 S    93.3 E
SpaceCom   Apr  1 06:12     Apr  1 12:40 +-4h        27.5 S    52.7 W
SpaceCom   Apr  1 10:31     Apr  1 12:41 +-2h        31.9 S    52.6 W
SpaceCom   Apr  1 14:22     Apr  1 12:29 +-21m       16.3 N    53.1 W

SatEvo     Mar 23 20:40     Apr  2 00:00 +-2.5d
SatEvo     Mar 25 23:40     Apr  2 00:00 +-1.5d
SatEvo     Mar 29 21:00     Apr  1 23:26 +-16h       12.1 S    38.7 W
SatEvo     Mar 30 19:25     Apr  1 16:03 +-10h       22.1 S    71.8 E
SatEvo     Mar 31 19:10     Apr  1 15:07 +-6h        71.1 N   103.4 W
SatEvo     Apr  1 22:25     Apr  1 12:37 +-40m       32.7 S    52.6 W

Final (?) elset:
Irid 11A S/D     4.0  2.0  0.0  5.5 d            151 x 124 km
1 25580U 98074D   99091.42964761  .27734558 -17031-5  23544-3 0  2246
2 25580  86.2999 143.7871 0021030 121.7361 238.8047 16.50835056 16180

Note: The narrow decay window indicated by SpaceCom suggests that 
one further elset may yet appear.
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Alan
-- 
 Alan Pickup | COSPAR 2707:   55d53m48.7s N   3d11m51.2s W   156m asl
 Edinburgh   | Home:   alan@wingar.demon.co.uk    +44 (0)131 477 9144
 Scotland    | SatEvo page:     http://www.wingar.demon.co.uk/satevo/