Re: Lacrosse 1 De-orbited?

Ed Cannon (ecannon@mail.utexas.edu)
Thu, 27 Mar 1997 04:10:30 -0600

A check on Lacrosse 1 possible close approaches using this elset:

Lacrosse 1      18.0  4.5  0.0  3.6 v
1 19671U 88106  B 97 67.48741065 0.00000035  00000-0  56900-5 0    07
2 19671  56.9770 123.3157 0010000 121.2846 238.7154 14.70733585    00

and Mike McCants' most recent alldat.tle with Rob Matson's Cola.exe 
yielded the results below.  (Note the **0.9 km** close approach predicted 
on 30 March 1997.  Also, six 94-29 and two 89-89 debris objects are listed.  
Three of the objects are other payloads.  I used a maximum separation of 
8 km.)  Perhaps they maneuvered Lacrosse 1 to avoid a possible collision?  
Newer Lacrosse 1 elements -- if available -- would be appreciated.

  Date    Univ. Time Norad     Name                 Range (km)  EphAge
--------- ---------- ----- --------------           ----------  ------
3/24/1997 10:27:58.4 24234 94029LH                       6.6     +3.62
3/24/1997 12:04:46.2 24501 94029VA                       7.0     +3.76
3/25/1997  6:57:21.9 23344 94074C                        7.4     +4.18
3/25/1997 19:10:47.2 23657 Sich 1                        7.3     +4.68
3/27/1997 16:38:32.7 15495 Cosmos 1626 Rk                6.8     +6.15
3/27/1997 17:22:18.8 18208 86019RF                       7.4     +7.40
3/28/1997  0:09:20.0 24378 94029QF                       2.2     +7.24
3/28/1997  8:14:33.1 24228 94029LB                       6.8     +7.60
3/28/1997 10:24:37.8 10479 77065EM                       7.9     +7.30
3/28/1997 14:26:47.1 23607 UPM LBSAT 1                   7.8     +7.77
3/30/1997  7:33:02.2 24350 94029PB                *****  0.9     +8.83 *****
3/31/1997  3:21:46.4 22236 Cosmos 2221                   4.3     +9.99
3/31/1997 10:24:40.9 22776 89089AM                       3.5    +14.13
3/31/1997 12:09:19.3  8092 72058DT                       5.8    +11.08
4/ 1/1997  0:06:39.7 22820 89089AN                       3.1    +10.74
4/ 2/1997 23:41:23.5 24110 94029FH                       7.1    +13.25

Ed Cannon
ecannon@mail.utexas.edu
Austin, Texas, USA
30.308N, 97.728W