Decay watch: Mar 12 (NOSS r decayed)
Alan Pickup (alan@wingar.demon.co.uk)
Fri, 12 Mar 1999 17:08:00 +0000
A trip will prevent me from posting my next "Decay watch" note until
Sunday. The NOSS Titan is down...
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Object: #23863 = 96- 29 G = NOSS 2-3 Titan r
Decay prediction:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom Mar 6 07:16 Mar 10 06:14 +-2d 3.1 S 92.0 E
SpaceCom Mar 9 00:53 Mar 11 14:31 +-2d 9.5 N 45.6 W
SpaceCom Mar 9 19:40 Mar 11 14:56 +-1d 63.0 S 31.4 E
SpaceCom Mar 11 10:18 Mar 12 09:35 +-14h 0.3 N 28.9 E
SpaceCom Mar 11 22:28 Mar 12 10:28 +-8h 33.6 N 145.0 W
SpaceCom Mar 12 04:34 Mar 12 10:47 +-4h 53.5 N 31.6 W
SpaceCom Mar 12 08:30 Mar 12 10:56 +-2h 24.9 N 4.8 W
SpaceCom Mar 12 11:11 Mar 12 10:29 +-42m 36.3 N 143.1 W
SatEvo Mar 4 20:15 Mar 10 09:12 +-1.5d 0 44.4 E
SatEvo Mar 6 18:00 Mar 9 21:23 +-16h 0 135.8 E
SatEvo Mar 8 19:00 Mar 11 12:49 +-18h 54.7 N 60.2 W
SatEvo Mar 9 22:20 Mar 12 01:33 +-14h 0 29.3 W
SatEvo Mar 10 23:35 Mar 11 22:36 +-6h 0 37.5 E
SatEvo Mar 11 20:00 Mar 12 07:54 +-4h 42.4 N 27.1 E
SatEvo Mar 12 16:30 Mar 12 10:42 +-4h 60.0 N 48.0 W
Final elset:
NOSS 2-3 r 9.8 3.0 0.0 4.8 v 127 x 118 km
1 23863U 96029G 99071.36800111 .08323079 88519-5 36306-4 0 669
2 23863 63.3909 161.9419 0007155 261.8021 98.2442 16.56462946 74855
Note: The ndot2 drag term in the above elset (0.08323079) is certainly
too low. Both SpaceCom and SatEvo have it surviving into the following
orbit. However, even with SatEvo's new facility for handling the
atmospheric flow transition, this lasted longer than I predicted -
SpaceCom did much better. More tuning required, I think :)
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Object: #25166 = 98- 8 E = Globalstar 1 Delta r
Decay prediction:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom Mar 9 20:05 Mar 16 07:53 +-4d 12.6 N 7.3 E
SpaceCom Mar 12 07:25 Mar 16 02:38 +-2d 3.6 N 105.1 W
SatEvo Mar 9 23:05 Mar 16 12:16 +-2.5d
SatEvo Mar 10 23:20 Mar 15 21:30 +-1.5d
SatEvo Mar 11 20:25 Mar 16 00:28 +-1.4d
SatEvo Mar 12 16:50 Mar 16 01:53 +-18h
Latest elset:
Gblstr 1 Dlt r 5.9 2.4 0.0 5.0 v 301 x 185 km
1 25166U 98008E 99071.63058253 .01858521 11721-4 92773-3 0 4939
2 25166 52.6633 308.1606 0087507 3.3351 356.7941 16.11272600 58568
Note: As I suspected, yesterday's "latest" elset was a rogue.
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Object: #25472 = 98- 51 F = Iridium 82 Delta r
Decay prediction:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom Mar 11 23:11 Mar 15 23:38 +-2d 9.8 N 26.2 E
SatEvo Mar 9 22:45 Mar 15 12:33 +-2d
SatEvo Mar 10 23:45 Mar 14 23:57 +-1d
SatEvo Mar 11 20:30 Mar 15 02:10 +-1d
SatEvo Mar 11 20:30 Mar 15 13:16 +-18h
Latest elset:
Iridm 82 Delta r 5.9 2.4 0.0 5.6 d 244 x 205 km
1 25472U 98051F 99071.60172683 .01572194 -13041-5 87327-3 0 2797
2 25472 83.4050 195.0568 0029317 347.3946 12.6555 16.18324936 28944
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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/