Re: HST close approaches

Alan Pickup (alan@wingar.demon.co.uk)
Sat, 22 Mar 1997 08:04:41 +0000

Regarding close approaches between the HST and other objects, ROB MATSON
<ROBERT.D.MATSON@cpmx.saic.com> writes
>I came up with some interesting "near-hits".  Times and dates are
>Pacific Standard Time (UT - 8 hrs):
>
>            Pacific
>   Date    Local Time Norad       Name       Range (km)  EphAge
>---------- ---------- ----- --------------   ----------  ------
> 3/18/1997 17:13:43.0  3699 68091AN              1.2     +5.67
> 3/22/1997  6:12:43.0 10493 77065ES              1.2     +9.60
> 3/24/1997  4:41:59.2 15889 Cosmos 1666          2.9    +10.41
> 3/23/1997 15:43:03.5 16111 Cosmos 1689 Rk       1.5     +9.44
> 3/23/1997  4:24:49.6 24391 94029QU              0.6     +9.17
> 3/23/1997 14:07:23.2 24568 94029XU              9.0    +10.30
>
>The last two objects are part of the Pegasus debris storm.  If some one has
>more recent element sets for any of these objects, it might be interesting to
>see how much the minimum range changes.  I used the ALLSAT.DAT file for
>3/15/97.  --Rob

Here, still warm off OIG BBS server, are the latest two (at least)
elsets for each of these:

Cosmos 249 deb AN                                1390 x 514 km
1 03699U 68091AN  97079.25045169  .00000580  00000-0  16255-3 0  5097
2 03699  62.3203 121.0970 0597259 119.2935 246.9175 13.83336486318665
Cosmos 249 deb AN                                1390 x 514 km
1 03699U 68091AN  97080.19016018  .00000580  00000-0  16255-3 0  5026
2 03699  62.3203 118.4066 0597254 119.5172 246.6788 13.83337876318797

Delta 1 deb ES                                   1329 x 600 km
1 10493U 77065ES  97079.08574628 -.00000160  00000-0  00000-0 0  1130
2 10493  29.7276 332.5132 0496673 214.3344 142.4232 13.79897758850417
Delta 1 deb ES                                   1329 x 600 km
1 10493U 77065ES  97080.09844482 -.00000036  00000-0  00000-0 0  1076
2 10493  29.7275 327.1159 0496442 222.9295 133.1521 13.79898385850559

Cosmos 1666                                      623 x 596 km
1 15889U 85058A   97079.11427531  .00000278  00000-0  28772-4 0  4669
2 15889  82.5246 290.8691 0019773 314.0859  45.8729 14.86283170632244
Cosmos 1666                                      623 x 596 km
1 15889U 85058A   97080.12412792  .00000252  00000-0  25809-4 0  4733
2 15889  82.5247 289.9198 0019748 310.7573  49.1928 14.86283453632392

Cosmos 1689 SL-3 r                               620 x 550 km
1 16111U 85090B   97080.04589242  .00000804  00000-0  78270-4 0  2027
2 16111  97.4899  86.4328 0050890 132.4852 228.0687 14.94196929622711
Cosmos 1689 SL-3 r                               620 x 549 km
1 16111U 85090B   97080.58163222  .00000883  00000-0  85456-4 0  1909
2 16111  97.4899  86.9436 0051008 130.6655 229.9016 14.94198477622793

Pegasus deb QU                                   617 x 508 km
1 24391U 94029QU  97079.94987863  .00177066  00000-0  12540-1 0  2194
2 24391  81.9504 269.5710 0078789  36.2396 324.3645 15.01491888 41003
Pegasus deb QU                                   617 x 507 km
1 24391U 94029QU  97080.48298334  .00153801  00000-0  10887-1 0  2208
2 24391  81.9516 269.0221 0079340  32.2554 328.0469 15.01585930 41089

Pegasus deb XU                                   631 x 492 km
1 24568U 94029XU  97078.82781155  .00209158  00000-0  14067-1 0  1599
2 24568  82.0512 277.3569 0099701  53.8179 307.1936 15.01794878 39622
Pegasus deb XU                                   633 x 489 km
1 24568U 94029XU  97079.49408345  .00185374  00000-0  12606-1 0  1602
2 24568  82.0521 276.6885 0103431  52.0653 309.0450 15.02002415 39946
Pegasus deb XU                                   631 x 490 km
1 24568U 94029XU  97079.49403385  .00200300  00000-0  13344-1 0  1619
2 24568  82.0534 276.6883 0101556  50.6410 310.2550 15.02032541 39723

Predictions for the two high-drag Pegasus debris objects will be the
least certain - I expect both to decay by mid-May.

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
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