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 ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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