HST/Cosmos 389 r "dance"

Rob Matson (Rob_Matson@cpqm.mail.saic.com)
26 Jun 1996 15:38:17 -0800

                      Subject:                              Time:  15:16
  OFFICE MEMO         HST/Cosmos 389 r "dance"              Date:  96/06/26

I'm continuing to play around with close approaches between satellites, and
noticed the following on-going "dance" between the Hubble Space Telescope and
Cosmos 389 R/B.  At 6:44:30.0 PDT today (Wed 6/26/96) the two made their
closest *predicted* approach of only 1.3 km!  I used the following TLEs for
these two:

Hubble Space Telescope (HST)
1 20580U 90037  B 96173.60393572  .00000273  00000-0  11806-4 0  8165
2 20580  28.4687 190.1615 0005997 218.2721 141.7438 14.91067041139248

Cosmos 389 Block E 3rd stage
1 04814U 70113  B 96173.27312728  .00000182  00000-0  14923-4 0  4200
2 04814  81.1844 241.2922 0060211 305.7742  53.7881 14.93109311376836

...which produced the following series of encounters:

   Date    Local Time Norad           Name           Range (km)  EphAge
 6/24/1996 16:57:06.1  4814 Cosmos 389 Block E 3rd st   199.7     +3.72
 6/24/1996 18:33:35.7  4814 Cosmos 389 Block E 3rd st   185.5     +3.79
 6/24/1996 20:10:05.3  4814 Cosmos 389 Block E 3rd st   171.4     +3.86
 6/24/1996 21:46:34.9  4814 Cosmos 389 Block E 3rd st   157.4     +3.93
 6/24/1996 23:23:04.5  4814 Cosmos 389 Block E 3rd st   143.5     +3.99
 6/25/1996  0:59:34.1  4814 Cosmos 389 Block E 3rd st   129.7     +4.06
 6/25/1996  2:36:03.7  4814 Cosmos 389 Block E 3rd st   115.9     +4.13
 6/25/1996  4:12:33.2  4814 Cosmos 389 Block E 3rd st   102.3     +4.19
 6/25/1996  5:49:02.8  4814 Cosmos 389 Block E 3rd st    88.8     +4.26
 6/25/1996  6:37:08.4  4814 Cosmos 389 Block E 3rd st   196.6     +4.29
 6/25/1996  7:25:32.3  4814 Cosmos 389 Block E 3rd st    75.3     +4.33
 6/25/1996  8:13:37.9  4814 Cosmos 389 Block E 3rd st   182.9     +4.36
 6/25/1996  9:02:01.8  4814 Cosmos 389 Block E 3rd st    61.9     +4.39
 6/25/1996  9:50:07.4  4814 Cosmos 389 Block E 3rd st   169.2     +4.43
 6/25/1996 10:38:31.3  4814 Cosmos 389 Block E 3rd st    48.7     +4.46
 6/25/1996 11:26:36.9  4814 Cosmos 389 Block E 3rd st   155.6     +4.50
 6/25/1996 12:15:00.8  4814 Cosmos 389 Block E 3rd st    35.5     +4.53
 6/25/1996 13:03:06.4  4814 Cosmos 389 Block E 3rd st   142.2     +4.56
 6/25/1996 13:51:30.3  4814 Cosmos 389 Block E 3rd st    22.5     +4.60
 6/25/1996 14:39:35.9  4814 Cosmos 389 Block E 3rd st   128.8     +4.63
 6/25/1996 15:27:59.8  4814 Cosmos 389 Block E 3rd st     9.8     +4.66
 6/25/1996 16:16:05.3  4814 Cosmos 389 Block E 3rd st   115.5     +4.70
 6/25/1996 17:04:29.2  4814 Cosmos 389 Block E 3rd st     4.9     +4.73
 6/25/1996 17:52:34.8  4814 Cosmos 389 Block E 3rd st   102.2     +4.76
 6/25/1996 18:40:58.7  4814 Cosmos 389 Block E 3rd st    16.8     +4.80
 6/25/1996 19:29:04.2  4814 Cosmos 389 Block E 3rd st    89.1     +4.83
 6/25/1996 20:17:28.1  4814 Cosmos 389 Block E 3rd st    29.4     +4.86
 6/25/1996 21:05:33.7  4814 Cosmos 389 Block E 3rd st    76.1     +4.90
 6/25/1996 21:53:57.6  4814 Cosmos 389 Block E 3rd st    42.0     +4.93
 6/25/1996 22:42:03.1  4814 Cosmos 389 Block E 3rd st    63.1     +4.96
 6/25/1996 23:30:27.0  4814 Cosmos 389 Block E 3rd st    54.5     +5.00
 6/26/1996  0:18:32.5  4814 Cosmos 389 Block E 3rd st    50.3     +5.03
 6/26/1996  1:06:56.4  4814 Cosmos 389 Block E 3rd st    67.0     +5.07
 6/26/1996  1:55:01.9  4814 Cosmos 389 Block E 3rd st    37.5     +5.10
 6/26/1996  2:43:25.8  4814 Cosmos 389 Block E 3rd st    79.3     +5.13
 6/26/1996  3:31:31.3  4814 Cosmos 389 Block E 3rd st    24.9     +5.17
 6/26/1996  4:19:55.2  4814 Cosmos 389 Block E 3rd st    91.6     +5.20
 6/26/1996  5:08:00.7  4814 Cosmos 389 Block E 3rd st    12.3     +5.23
 6/26/1996  5:56:24.6  4814 Cosmos 389 Block E 3rd st   103.7     +5.27
 6/26/1996  6:44:30.0  4814 Cosmos 389 Block E 3rd st     1.3     +5.30
 6/26/1996  7:32:54.0  4814 Cosmos 389 Block E 3rd st   115.8     +5.33
 6/26/1996  8:20:59.4  4814 Cosmos 389 Block E 3rd st    12.7     +5.37
 6/26/1996  9:09:23.3  4814 Cosmos 389 Block E 3rd st   127.8     +5.40
 6/26/1996  9:57:28.7  4814 Cosmos 389 Block E 3rd st    24.9     +5.43
 6/26/1996 10:45:52.7  4814 Cosmos 389 Block E 3rd st   139.7     +5.47
 6/26/1996 11:33:58.1  4814 Cosmos 389 Block E 3rd st    37.1     +5.50
 6/26/1996 12:22:22.0  4814 Cosmos 389 Block E 3rd st   151.5     +5.53
 6/26/1996 13:10:27.4  4814 Cosmos 389 Block E 3rd st    49.2     +5.57
 6/26/1996 13:58:51.3  4814 Cosmos 389 Block E 3rd st   163.2     +5.60
 6/26/1996 14:46:56.7  4814 Cosmos 389 Block E 3rd st    61.2     +5.63
 6/26/1996 15:35:20.7  4814 Cosmos 389 Block E 3rd st   174.8     +5.67
 6/26/1996 16:23:26.0  4814 Cosmos 389 Block E 3rd st    73.2     +5.70
 6/26/1996 17:11:50.0  4814 Cosmos 389 Block E 3rd st   186.3     +5.74
 6/26/1996 17:59:55.3  4814 Cosmos 389 Block E 3rd st    85.0     +5.77
 6/26/1996 18:48:19.3  4814 Cosmos 389 Block E 3rd st   197.7     +5.80
 6/26/1996 19:36:24.6  4814 Cosmos 389 Block E 3rd st    96.7     +5.84
 6/26/1996 21:12:53.9  4814 Cosmos 389 Block E 3rd st   108.4     +5.90
 6/26/1996 22:49:23.2  4814 Cosmos 389 Block E 3rd st   119.9     +5.97
 6/27/1996  0:25:52.4  4814 Cosmos 389 Block E 3rd st   131.3     +6.04
 6/27/1996  2:02:21.7  4814 Cosmos 389 Block E 3rd st   142.7     +6.10
 6/27/1996  3:38:50.9  4814 Cosmos 389 Block E 3rd st   153.9     +6.17
 6/27/1996  5:15:20.1  4814 Cosmos 389 Block E 3rd st   165.1     +6.24
 6/27/1996  6:51:49.4  4814 Cosmos 389 Block E 3rd st   176.1     +6.30
 6/27/1996  8:28:18.6  4814 Cosmos 389 Block E 3rd st   187.1     +6.37
 6/27/1996 10:04:47.8  4814 Cosmos 389 Block E 3rd st   198.0     +6.44

A bit close for comfort!  --Rob