Re: ISS vs MIR

From: Igor Lissov (i-cosmos@mtu-net.ru)
Date: Tue May 02 2000 - 01:27:27 PDT

  • Next message: Matthew.Fawcett@eastriding.gov.uk: "Iridium 30 long flare (+aurora again!)"

    Hi Ben,
    
    >There was a question a ways back: will the ISS and MIR ever appear in the
    >same sky in one night? And I beleive the answer was no, they are on
    opposite
    >sides or earth, and whenever on is in the morning, the other is in the
    >evening.
    >    Well, today, May 1 200, both MIR and ISS are in the evening, just 2
    >minutes apart! It seems unusual to me (are they gonna colide?!). However, I
    >suspect it to be from the 'lagging' of the ISS. It has dropped
    considerably.
    >(Feeew! They're at different heights!)
    
    Right today, May 2, the two objects passed only 47 kilometers from
    each other at 0617 UTC to the north of Hawaii. COLA software gives:
    
     5/ 2/1972  3:14:25.5 16609 MIR                         444.6    94.1  -0.06
     5/ 2/1972  4:00:15.4 16609 MIR                         334.3    91.5  -0.02
     5/ 2/1972  4:46:01.1 16609 MIR                         227.2   100.8  +0.01
     5/ 2/1972  5:31:51.2 16609 MIR                         115.1    98.0  +0.04
     5/ 2/1972  6:17:36.7 16609 MIR                          46.1   177.0  +0.07
     5/ 2/1972  7:03:27.0 16609 MIR                         107.8    98.8  +0.10
     5/ 2/1972  7:49:12.3 16609 MIR                         222.7   101.0  +0.14
     5/ 2/1972  8:35:02.8 16609 MIR                         327.3    91.7  +0.17
     5/ 2/1972  9:20:47.9 16609 MIR                         440.6    94.1  +0.20
    
    Mir is slightly higher now (period of 91.92 min vs. 91.29 min of ISS),
    and this unique situation will not repeat soon.
    
    Igor Lissov
    
    
    
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