Re: Decay watch: Echostar 4 Proton rocket

Alan Pickup (alan@wingar.demon.co.uk)
Sun, 10 May 1998 11:53:05 +0100

OIG report that this object decayed today, May 10, and offers the
following final elsets via Telnet access to their BBS:

Echostar 4 Proton r                              171 x 134 km
1 25332U 98028B   98129.69222056  .07082157  12591-4  11589-3 0   139
2 25332  51.5970 221.6387 0027987 279.2042  81.8181 16.45091072   284
Echostar 4 Proton r                              169 x 134 km
1 25332U 98028B   98129.69201200  .08520538  12598-4  13479-3 0   146
2 25332  51.6126 221.6352 0027250 277.5363  82.2418 16.45401132   280

OIG's WWW pages report only the first of these, presumably because it
has the later epoch of the two for this equator crossing. Judging from
the elset sequence numbers (the "13" and "14" before the checksum at the
end of the first lines), the second elset is more recent and presumably
the more accurate. In fact, they differ by only 0.22 sec in equator
crossing times even though the epochs differ by 18 seconds.

The final elset shows the Proton running 0.34 sec early with respect to
the SatEvo evolution in my previous posting. My conclusion about the
decay is unchanged at May 9.99 (23:45 UTC +- 90 minutes), most likely
over the S Atlantic near 24 deg S, 24 deg W.

Alan
-- 
 Alan Pickup | COSPAR site 2707:   55d53m48.7s N   3d11m51.2s W    156m asl
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