Decay watch: May 27
Alan Pickup (alan@wingar.demon.co.uk)
Thu, 27 May 1999 20:37:05 +0100
SpaceCom has issued no further elsets for the decaying Titan...
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Object: #25745 = 99- 28 B = USA 144 Titan 4 r
Decay predictions:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom May 24 21:58 Jun 2 11:36 +-5d 63.4 S 94.0 W
SpaceCom May 26 06:28 Jun 1 14:00 +-4d 47.1 N 3.3 W
SatEvo May 25 12:00 Jun 3 +-3d
SatEvo May 27 19:00 Jun 1 23:00 +-1.4d
Latest elset (from Pierre Neirinck via Rainer Kracht):
USA 144 Titan 4 r 268 x 199 km
1 25745U 99028 B 99147.16107100 .01096472 00000-0 63770-3 0 05
2 25745 63.3642 84.7284 0052677 167.4918 192.4329 16.14895721 09
SatEvo prediction:
USA 144 Titan 4 r 261 x 195 km
1 25745U 99028 B 99148.02749965 .01245538 65973-3 63562-3 0 90002
2 25745 63.3635 81.3117 0049399 167.5107 192.6121 16.16918893 142
USA 144 Titan 4 r 256 x 193 km
1 25745U 99028 B 99148.52207146 .01353477 80340-3 63381-3 0 90003
2 25745 63.3631 79.3567 0047392 167.5216 192.5961 16.18202560 225
USA 144 Titan 4 r 251 x 191 km
1 25745U 99028 B 99149.01623376 .01486800 10154-2 63214-3 0 90002
2 25745 63.3626 77.3995 0045267 167.5326 192.5797 16.19603477 302
Note: The SatEvo predictions are based entirely on Pierre's elset.
A fit including the earlier SpaceCom elsets leads to an elset with
higher eccentricity and drag, nearly identical mean motion, and decay
at June 1 11:00 UTC +-1.3d.
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Object: #25683 = 99- 20 B = Landsat 7 Delta r
Decay predictions:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom May 26 20:46 May 30 20:26 +-2d 25.7 S 102.5 W
SatEvo May 25 19:30 Jun 1 00:00 +-1.2d
SatEvo May 26 18:00 May 31 10:00 +-1d
SatEvo May 27 18:00 May 31 09:00 +-0.8d
Latest elset:
Lndst7 Delta r 5.9 2.4 0.0 5.0 d 333 x 150 km
1 25683U 99020B 99147.67397540 .02725187 91108-5 32700-3 0 1268
2 25683 107.5636 271.1600 0138122 243.3097 115.4136 16.12040977 6561
SatEvo prediction:
Lndst7 Delta r 5.9 2.4 0.0 5.0 d 323 x 149 km
1 25683U 99020B 99148.04611688 .02753232 17074-2 30562-3 0 91264
2 25683 107.5629 272.1436 0131485 242.4219 116.2364 16.13906196 6626
Lndst7 Delta r 5.9 2.4 0.0 5.0 d 293 x 146 km
1 25683U 99020B 99149.03615881 .03432587 30962-2 27362-3 0 91266
2 25683 107.5608 274.7750 0111537 240.0465 118.8415 16.19963966 6789
Note: The latest elset shows this running 2.6 seconds early against
the SatEvo prediction I gave yesterday.
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Alan
--
Alan Pickup | COSPAR 2707: 55d53m48.7s N 3d11m51.2s W 156m asl
Edinburgh | Tel: +44 (0)131 477 9144 Fax: +44 (0)870 0520750
Scotland | SatEvo page: http://www.wingar.demon.co.uk/satevo/