Decay update: Titan rocket
Alan Pickup (alan@wingar.demon.co.uk)
Mon, 31 May 1999 23:26:43 +0100
Many thanks (and well done) to Tristan Cools, Rainer Kracht, Alexander
Seidel and Wim Holwerda for observational reports of the Titan around
May 31 20:42. An adjustment to the predicted orbital evolution brings it
more into line with the observations and pushes the decay back closer to
SpaceCom's prediction on the 1st.
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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
SpaceCom May 28 11:26 Jun 1 11:29 +-2d 19.2 N 172.6 E
SpaceCom May 29 13:30 Jun 1 13:04 +-2d 6.9 S 161.8 E
SpaceCom May 30 16:04 Jun 1 11:07 +-1d 54.4 N 52.3 E
SpaceCom May 31 13:15 Jun 1 13:44 +-18h 12.1 S 37.8 W
SatEvo May 25 12:00 Jun 3 +-3d
SatEvo May 27 19:00 Jun 1 23:00 +-1.4d
SatEvo May 28 21:25 Jun 1 02:43 +-20h
SatEvo May 29 16:20 Jun 1 06:25 +-18h
SatEvo May 30 13:40 Jun 1 07:49 +-12h
SatEvo May 31 17:30 Jun 1 07:48 +-9h 16.5 S 49.3 E
SatEvo May 31 22:10 Jun 1 10:05 +-4h 0.0 157.0 W
Latest elset by Rainer Kracht (unchanged):
USA 144 Titan 4 r 226 x 178 km
1 25745U 99028 B 99150.37082156 .02600828 00000-0 65758-3 0 00
2 25745 63.3428 72.0095 0036428 179.2003 180.7988 16.26397285 09
Updated SatEvo prediction:
USA 144 Titan 4 r 178 x 152 km
1 25745U 99028 B 99152.02526141 .09079805 63781-1 46470-3 0 90008
2 25745 63.3382 65.3277 0019660 179.2492 180.7537 16.40422077 279
USA 144 Titan 4 r 164 x 143 km
1 25745U 99028 B 99152.20792483 .15249160 19604+0 37085-3 0 90007
2 25745 63.3369 64.5789 0015389 179.2549 180.7474 16.44651782 305
USA 144 Titan 4 r 147 x 133 km
1 25745U 99028 B 99152.32936509 .28303045 57468+0 31598-3 0 90009
2 25745 63.3355 64.0779 0010814 179.2588 180.7427 16.49644182 326
USA 144 Titan 4 r 133 x 124 km
1 25745U 99028 B 99152.38991060 .52904418 27676+1 31598-3 0 90005
2 25745 63.3343 63.8264 0007334 179.2607 180.7403 16.54097861 331
Note: I now predict decay near a southbound equator crossing south of
Hawaii.
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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/