Re: favorable USA-129-KH perihelium pass

From: Ralf Vandebergh (
Date: Sat Apr 09 2011 - 21:19:37 UTC

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    Just observed visually USA-186 in todays 60 degrees pass. (21:03 UTC).  Mag: 
    5.1 with 7x50 bino. I also saw the flare in the NW.
    Interesting was the brightness behaviour. First stable brightness, then 
    getting fainter at around culm for quite a  while in WSW, then quickly 
    getting back
    to earlier brightness level, then the short flare, and then brightness 
    stabilized back.
    The brighter parts in the pass could be sufficient for my imaging system, so 
    maybe a try in one of future passes.
    First process the USA-129 images...
    Best wishes,
    The other KH-12, USA 186, flared brightly as well at 20:44 UTC
    - Marco 
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