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 _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sun Feb 02 2020 - 22:28:12 UTC
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