RE: RE: Mir (16609) and Soyuz T-15 (16643)

From: Scott Tilley via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 2 Feb 2020 20:27:26 -0800
Hi All

This subject is an extension of an old thread:

http://satobs.org/seesat/Mar-2011/0195.html

Today on twitter"huub eggen,_at_phi48" shared this excerpt from an old 
Spaceflight magazine article.

https://www.dropbox.com/s/pp4n05yo4cr7hxa/EPyBjrkX0AEf-_E.jpeg?dl=0

I remember collecting these as a teen and reading about the exploits of 
satellite trackers and the goings on in space before we had the modern 
Internet.  All I had back then was a magazine, amateur packet radio and 
periodic run ins with my parents calling a BBS in Texas for TLEs...

Daniel Fischer had snapped a shot at what some may remember as the 
beginning of one of the most interesting and greatest achievements of 
manned spaceflight, the recovery of Salyut-7.  A daring mission by a 
couple of cosmonauts with the senses of really good technicians.

I took the image from the article and conducted a modern analysis of it 
using Cees Bassa's SATTOOLS and TLEs provided by Ted Molczan and 
Jonathan McDowell.

Daniel when pressed after an initial release of the analysis recalled 
that he may have been in Königswinter-Heisterbacherrott, West Germany at 
the time, 50° 42′ N 7° 14' E.

This resulted in an excellent fit to his image once I corrected the 
timing for best fit to the Salyut-7, 13138 TLE as a reference.  From 
that we can see the timing differences for the objects from the best 
TLEs at the time as Soyuz t-15 journeyed to Salyut-7 from MIR at that 
moment.

https://www.dropbox.com/s/4jiy1ketp3b86t2/Screenshot_2020-02-02_16-01-11.png?dl=0

https://www.dropbox.com/s/i670vb4occe79wz/Screenshot_2020-02-02_16-02-22.png?dl=0

16643,-0.500,-0.001,2.030,-0.493

13138,-0.281,0.047,2.030,-0.050

Where above = satno, delta_MA, delta_RAAN, rms, delta_t(seconds)

The TLEs used are these:

1 13138U          86176.98914563  .00027860           16248-3 0  2243
2 13138  51.6213 189.7768 0003787 337.0953  22.7841 15.78186229241153

1 16643U 86022A   86177.43191047  .00029856  00000-0  16248-3 0  1004
2 16643  51.6226 187.4779 0000945  92.8523 267.2581 15.79692993241226

And for the record the IOD observations:

13138 -1 4676A  6667 G 19860625223221193 27 25 1528246+242355 17 S

16643 -1 4676A  6667 G 19860625223221193 27 25 1545270+261924 17 S

Best guess at location of observing site:

6667 DF   50.7 7.2333      60    Daniel's Secret Lair

Regards,

Scott Tilley



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Received on Sun Feb 02 2020 - 22:28:12 UTC

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