RE: ISS-Soyuz How close?

From: Ted Molczan <ssl3molcz_at_rogers.com>
Date: Wed, 26 Mar 2014 14:15:57 -0400
Joe Rao asked:

> Does anyone have an idea about how close (or how far apart) the Soyuz
> spacecraft and the ISS will be until they make their next docking attempt late
> tomorrow? 

Below is the range between 98067A / 25544 and 14013A / 39622 for the 24 h ending Mar 27 16:00 UTC, based on USSTRATCOM's
epoch 14085.54334446 TLE of 98067A and its epoch 14085.60961156 TLE of 14013A:

    2014 Mar 26
   UTC     Range km
16:00:00   1479.32 
16:30:00   1448.63 
17:00:00   1428.64 
17:30:00   1421.46 
18:00:00   1392.72 
18:30:00   1369.76 
19:00:00   1363.27 
19:30:00   1336.79 
20:00:00   1311.04 
20:30:00   1304.76 
21:00:00   1280.75 
21:30:00   1252.52 
22:00:00   1245.97 
22:30:00   1224.54 
23:00:00   1194.25 
23:30:00   1186.93 

    2014 Mar 27
   UTC     Range km
00:00:00   1168.08 
00:30:00   1136.27 
01:00:00   1127.68 
01:30:00   1111.33 
02:00:00   1078.58 
02:30:00   1068.26 
03:00:00   1054.24 
03:30:00   1021.17 
04:00:00   1008.71 
04:30:00    996.79 
05:00:00    964.02 
05:30:00    949.08 
06:00:00    938.97 
06:30:00    907.07 
07:00:00    889.45 
07:30:00    880.78 
08:00:00    850.26 
08:30:00    829.86 
09:00:00    822.24 
09:30:00    793.53 
10:00:00    770.38 
10:30:00    763.36 
11:00:00    736.79 
11:30:00    711.07 
12:00:00    704.17 
12:30:00    679.97 
13:00:00    651.97 
13:30:00    644.70 
14:00:00    623.01 
14:30:00    593.12 
15:00:00    584.98 
15:30:00    565.84 
16:00:00    534.55

I do not know whether any manoeuvres are planned during the above period.

> Would they far enough apart to perceive as  two objects flying in
> tandem or will they be so close together so as to appear as a singular
> object visually to the unaided eye?

Assuming the above is accurate, then they will be gradually closing, but remain far apart this evening through tomorrow
morning.

Ted Molczan


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Received on Wed Mar 26 2014 - 13:17:27 UTC

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