Oribital close-encounters u

ROB MATSON (ROBERT.D.MATSON@cpmx.saic.com)
15 Aug 1997 14:42:43 -0800

Here's a close approach update for the three encounters I've mentioned
in the last few days:

The Iridium 7 (#24793) encounter with Spot 1 r Deb C (#16615) has come and
gone (presumably without incident!).  Based on latest OIG elements (below),
closest approach was 1.2 km at 0:20:26.60 on 8/15/97.

Iridium 7
1 24793U 97020B   97227.14179669 +.00000160 +00000-0 +49920-4 0 00764
2 24793 086.3992 106.3502 0002112 234.4677 125.6321 14.34215698014615
Spot 1 r Deb     1.5  0.0  0.0  6.5 d
1 16615U 86019C   97227.20033239 +.00000575 +00000-0 +20609-3 0 01980
2 16615 098.3113 277.6399 0019681 315.1492 044.8104 14.37438821599622

Likewise, Iridium 8's (#24792) encounter with Cosmos 1452 R/B (13992)
occurred about 12 hours ago on August 15th at 9:39:35.41 UTC.  Closest
distance was a scant 0.9 km based on these elements from OIG:

Iridium 8
1 24792U 97020A   97227.14811872 -.00000004 +00000-0 -84544-5 0 00774
2 24792 086.3990 106.3678 0001739 092.9846 267.1558 14.34211593014619
Cosmos 1452 R/B
1 13992U 83031B   97227.20239090 +.00000027 +00000-0 +19564-4 0 08943
2 13992 074.0493 310.0440 0006041 284.7345 075.3138 14.32879069749533

The Hubble Space Telescope (#20580) encounter with STEP 2 Pegasus
Deb LE (#24231) is just 3 hours away at 0:43:22.38 UTC on Aug 16.
Closest approach is still predicted to be 1.1 km using these elements:

Hubble Space Telescope (HST)
1 20580U 90037B   97226.96804629 +.00000288 +00000-0 +15437-4 0 09918
2 20580 028.4651 022.6631 0014560 085.2441 274.9821 14.86470849201819
STEP 2 Pegasus Deb LE
1 24231U 94029LE  97226.83668703  .00000227  00000-0  29518-4 0   961
2 24231  82.0934 130.7857 0092720 268.1405  90.9189 14.73684736 64013
#026#