Mir final trajectory

From: Harro Zimmer (Harro.Zimmer@t-online.de)
Date: Mon Feb 05 2001 - 06:06:15 PST

  • Next message: Greg Roberts: "Re USA 116 3 Feb 2001"

    Dear SeeSaters:
    
    In respect to the discussion let me add some remarks, extracted from an informal
    talk some times ago with a engineer cosmonaut in charge for the MIR final emer- 
    gency crew and for my own analysis of the PROGRESS reentries over nearly two
    decades.
    
    1) Under the (realistic) assumption, based on PROGRESS reentries, that the 
       "target region" is around 47S, 140W and the decisive command and/or       
       controll of the final burn comes from the Baikonur area, the ascending node  
       of the final orbit must be in the range 16.5E - 353.5E.
    
    2) An optimal trajectory to avoid risks for some Pacific Islands (e.g. the cited
       Nuku alofa, Tonga) has an ascending node around 16.6E. Mir would pass more
       then 1000 km east of this Island. The other limit - 353.5E - shows a pass
       about only 590 km away.
    
    3) My problem as a decay and reentry analyst for more 35 years is the Russian
      altitude definition for the "Splashdown area". The (western) space surveil-   
      lance  community defines the altitude of reentry at 122 km and the breakup   
      altitude at 78 km. It would be very interesting to see the Russian altitude
      versus time relation for the MIR reentry.
    
      Harro
    
      Harro.Zimmer@t-online.de
      Berlin, Germany
    
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