My update on the DirecTV Proton decay:
_____________________________________________________________________
Object: #27427 = 02- 23 B = DirecTV Proton rocket
Decay predictions:
Source Prediction made Predicted decay at Latitude Longitude
UTC UTC deg deg
SpaceCom May 8 15:51 May 9 04:09 +-8h 32.7 N 136.4 W
SatEvo May 8 21:40 May 9 05:54 +-5h 37.1 N 50.9 W
Latest elset:
DirecTV 5 Proton r 190 x 141 km
1 27427U 02023B 02128.61735259 .06705772 12440-4 20845-3 0 116
2 27427 51.6042 124.5713 0037317 277.3707 82.3122 16.39984715 156
SatEvo prediction:
DirecTV 5 Proton r 169 x 132 km
1 27427U 02023B 02128.92153695 .12589263 10940+0 18596-3 0 90117
2 27427 51.6026 122.8443 0028183 278.6620 81.0188 16.45664584 208
DirecTV 5 Proton r 163 x 130 km
1 27427U 02023B 02128.98223412 .14994245 15843+0 17992-3 0 90116
2 27427 51.6022 122.4978 0025588 278.9211 80.7892 16.47329507 212
DirecTV 5 Proton r 156 x 126 km
1 27427U 02023B 02129.04286469 .18620822 24752+0 17428-3 0 90119
2 27427 51.6016 122.1508 0022519 279.1806 80.5646 16.49350848 225
DirecTV 5 Proton r 147 x 122 km
1 27427U 02023B 02129.10341286 .24128338 33110+0 16547-3 0 90116
2 27427 51.6009 121.8031 0018767 279.4406 80.3471 16.51921662 239
DirecTV 5 Proton r 135 x 116 km
1 27427U 02023B 02129.16385575 .32792108 92104+0 15191-3 0 90114
2 27427 51.6001 121.4545 0014182 279.7013 80.1384 16.55227124 249
DirecTV 5 Proton r 114 x 105 km
1 27427U 02023B 02129.22414872 1.06217337 17285+2 24283-3 0 90113
2 27427 51.5988 121.1048 0006786 279.9629 79.9604 16.61336428 250
Note: There are observing opportunities as this heads towards eclipse
entry near 46 deg N in the evening sky. Eclipse exit occurs while
southbound a few deg N of the equator. Further elsets have been slow
to appear since my previous update and the prediction remains uncertain
by several orbits. My new prediction shows an earlier decay, though the
time will depend on by how much (and how quickly) the drag coefficient
changes in line with the atmospheric flow regime. My latest decay point
lies over the western Atlantic following a pass across southern Canada
from Vancouver at 05:41 UTC to Halifax, Nova Scotia, at 05:51.
SpaceCom's latest prediction puts the decay to the W of San Francisco
on the previous orbit.
_____________________________________________________________________
Alan
--
Alan Pickup / COSPAR 2707: 55.8968N 3.1989W +208m (WGS84 datum)
Edinburgh / SatEvo & elsets: http://www.wingar.demon.co.uk/satevo/
Scotland / Decay Watch: http://www.wingar.demon.co.uk/satevo/dkwatch/
*
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This archive was generated by hypermail 2b29 : Mon May 20 2002 - 18:25:35 EDT