Decays

From: BEHREND Raoul (Raoul.Behrend@obs.unige.ch)
Date: Thu Aug 31 2000 - 05:50:51 PDT

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    Hello,
    
    Harro.Zimmer wrote about decays:
    > 30 August, 21:57 UTC +/- 02 hours (33.0°N, 0.1°E)
    > 30 August, 21:52 UTC +/- 11 minutes (19.28°N, 346.40°E)
    > 30 August, 22:20 UTC +/- 03 hours (29.8°N,116.5°E)
    > 30 August, 21:54 +/- 11 minutes (25.45°N, 351.11°E)
    
    Well, I always asked me how can the localisations of impact be given at 10 or 1
    km (0.1, 0.01degree) for a satellite which travel at the speed of 30Mm/s, and
    in counterpart estimate the epoch of the scratch only at minutes or hours
    levels ? I saw uncertainties of more than 12 hours on these datas
    (corresponding to many times the earth's size), but with always the
    localisation of the impact at less the 10km, according to these datas.
    
    Very curious, isn't it ?   <;3)~~~~~
    
    Have a pleasant week-end, Raoul
    
    -----
    
    Observatoire de Genève
    Raoul Behrend
    CH-1290 Sauverny / Suisse
    
    Raoul.Behrend@Obs.UniGe.CH
    http://obswww.unige.ch/~behrend
    
    "Herbe à Nicot? Herbe à nigaud!"
    
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