Decaying Iridium rockets

Alan Pickup (alan@wingar.demon.co.uk)
Mon, 13 Apr 1998 19:50:46 +0100

Two Iridium rockets, a Delta 2 and a Long March (CZ-2C), should decay
within the next ten days or so.

Their latest elsets are:

Iridm 19 Delta r 5.9  2.4  0.0  5.6 d            260 x 203 km
1 24970U 97056F   98103.16901785  .01299602 -12941-5  81098-3 0  2610
2 24970  83.5921 267.9193 0043174 297.7906  61.8974 16.15548899 31070
Ir 51 CZ-2C r   12.0  3.5  0.0  4.3 d            468 x 165 km
1 25264U 98018C   98103.22404224  .01088293 -15239-5  49460-3 0   541
2 25264  86.3759   4.2170 0226011  97.7369 264.8896 15.84858341  2895

My current prediction is for the Iridium 19 Delta 2 to decay at about
April 17.0 (+-0.6d) and for the Iridium 51 Long March to follow it about
April 23 (+-2d).

Predicted elsets for the Delta:
Iridm 19 Delta r 5.9  2.4  0.0  5.6 d            248 x 198 km
1 24970U 97056F   98104.03536329  .01920520  18177-2  98105-3 0 92614
2 24970  83.5910 267.0675 0037994 294.2126  65.3908 16.18647316 31212
Iridm 19 Delta r 5.9  2.4  0.0  5.6 d            241 x 195 km
1 24970U 97056F   98104.52965509  .02233817  24251-2  99224-3 0 92614
2 24970  83.5903 266.5797 0034693 292.1637  67.4684 16.20693924 31291
Iridm 19 Delta r 5.9  2.4  0.0  5.6 d            232 x 191 km
1 24970U 97056F   98105.02327277  .02673636  36558-2  99875-3 0 92616
2 24970  83.5894 266.0909 0031049 290.1111  69.5549 16.23101407 31372
Iridm 19 Delta r 5.9  2.4  0.0  5.6 d            221 x 186 km
1 24970U 97056F   98105.51608468  .03377454  61986-2  10063-2 0 92618
2 24970  83.5884 265.6010 0026923 288.0541  71.6526 16.26052810 31451

This leaves eclipse at around 25-30 deg N latitude moving northbound
before dawn and has shadow entry over Antarctica.

The Long March has shadow exit southbound near 78 deg S and shadow entry
while southbound at about 65 deg N before local midnight.

Alan
-- 
 Alan Pickup | COSPAR site 2707:   55d53m48.7s N   3d11m51.2s W    156m asl
 Edinburgh   | Home:      alan@wingar.demon.co.uk       +44 (0)131 477 9144
 Scotland    | SatEvo satellite page: http://www.wingar.demon.co.uk/satevo/