Decay watch: Februray 6

Alan Pickup (alan@wingar.demon.co.uk)
Sat, 6 Feb 1999 10:36:51 +0000

SpaceCom decay notices:


Object                            Notice issued    Predicted decay
                                       UTC              UTC

#23529 = Intelsat 705 Centaur r   Feb  5 22:59     Feb  6 11:20 +-8h
#23529 = Intelsat 705 Centaur r   Feb  6 05:30     Feb  6 11:53 +-4h

#22584 = GPS 2-19 r2              Feb  4 06:09     Feb 11 05:45 +-4d

               -------------------------------

The latest elset for the Centaur is:

Intelsat 705 Centaur r                           403 x 106 km
1 23529U 95013B   99037.34789166  .51968309 -91063-5  59584-3 0   611
2 23529  26.5012 177.5089 0223872 296.3645  61.5221 16.07077578 62176

This shows it running 39 seconds early against yesterday's SatEvo
prediction. I suspect that SpaceCom have the eccentricity too high here
and that a more likely perigee height is 112-116 km.

My latest analysis brings decay forward one rev to February 6.52 (12:33
UTC +-90min). The track just before this takes it almost directly W->E
over Australia, passing ~600 km N of Perth at 12:23 UTC and over
Rockhampton in Queesnland at 12:31.

Predicted elsets, with eccentricity adjusted:

Intelsat 705 Centaur r                           333 x 110 km
1 23529U 95013B   99037.40975243  .92164931  15896+1  10842-2 0 90611
2 23529  26.4996 177.0225 0169008 297.1809  61.1063 16.19155913 62188
Intelsat 705 Centaur r                           261 x 108 km
1 23529U 95013B   99037.47122110 1.44812242  57489+1  12524-2 0 90611
2 23529  26.4974 176.5312 0115960 298.0057  60.8259 16.33028011 62196

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/