Re: Lacrosse 5 disappeared instead of flared at 21:51 UTC

From: Gerhard HOLTKAMP (
Date: Tue Aug 01 2006 - 17:29:04 EDT

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    Bram Dorreman wrote as a reaction to Marco Langbroek:
    >Triggered by the very interesting conversation about the Lacrosse 5
    >disappearance trick I follwed this very satellite from my location. I
    >timed when L5 disapperead. It was at UT 21:50:56.4 (with about 0.5 sec
    >accuracy) from my location at
    >COSPAR 4160
    >51° 16' 45.5" N 5° 28' 36.6" E (WGS84) 35 m
    I've observed that L5 pass with a 3'' refractor from my location at 49.8866 N, 
    8.6558 E between 21:48:59 UT (31-JUL-06) when it passed Eta Boo and a few 
    seconds after it passed Eta UMa at 21:50:56. It steadily increased in 
    brightness up to UMa. It seemed to decrease in brightness in the final few 
    seconds that I saw it (I lost contact due to some obstruction in my field of 
    view). But whether this was due to the disappearance effect or due to the 
    obstructions (and some clouds) getting in my way I  cannot re-construct.
    Half an hour ago (at 20:56:35, 1-AUG-06) I observed what looked like the 
    beginning of a flare of L5 (which passed from Arctures to UMa) but once again 
    clouds got into my way.
    Gerhard HOLTKAMP
    Darmstadt, Germany
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