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