Re: Progress spacecraft launch on june 22

From: Tony Beresford (
Date: Wed Jun 21 2006 - 09:13:43 EDT

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    At 19:28 21/06/06, Gordon Prichard wrote:
    >I have been wondering for a while if Progress or Soyuz vehicles are
    >visible to the unaided eye and if Heavens Above can be used to predict
    >their passage. Any comments would be appreciated.
    Gordon, Such vehicles are naked eye visible. 
    However like a shuttle launch to the ISS, the orbital elements
    have several large changes, over a short interval.
    this makes Heavens-above a bad choice as a predictor because of the
    multiple element sets involved. 
    In such circumstances I use several different TLes in my prediction programme,
    all run for the several day time interval. I switching my attention from 
    one "object" to the next as the various rendevous manouvers happen.
    Tony Beresford
    Adelaide, South Australia
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