Re: Lacrosse-5 flares and disappearance.

From: Gerhard HOLTKAMP (
Date: Thu Oct 18 2007 - 13:13:57 EDT

  • Next message: Bjorn Gimle \(GlocalNet\): "Re: Lacrosse-5 flares and disappearance."

    Sorry, I made a mistake subtracting two simple numbers: The difference between 
    20:12:15 and 20:15:15 would be 3 minutes and not three! Thus my observation 
    of the Lacrosse 5 disappearance was followed 3 minutes later by the 
    disappearance observed by Oleinikoff followed by another disappearance 2 
    minutes after that. 
    In response to Allen Thomson suggestion of simultaneous observations of this 
    disappearance trick from different sites we did just that earlier this year. 
    For instance on 26-MAR-07 such a Lacrosse 5 disappearance was observed 
    simultaneously from two different places in England from my site in Germany. 
    Of course there is no guarantee that the event on 14-AUG-07 would have been a 
    genuine satellite effect or a local observer effect but I still find it 
    interesting that there were three disappearances observed within just 7 
    minutes when during that time the position of the sun relative to the local 
    satellite frame changed by just 6 degrees.
    Gerhard HOLTKAMP
    Darmstadt, Germany,
    On Thursday 18 October 2007 14:57, Gerhard HOLTKAMP wrote:
    > on 14-OCT-07 Oleinikoff Nikolay wrote about Lacrosse 5 disappearances:
    > >14 Aug 2007
    > >In 20:14:53 - flare (? m.)
    > >And 20:15:14 - disappeared.
    > >In 20:17:03 - now re-appeared with flash +1.0 m.
    > >And 20:17:15 - disappeared.
    > >In 20:17:18 - now re-appearance +2.0 m. (+/-3s.)
    > I just remembered having taken a few pictures of Lacrosse 5 at the time.
    > The first 15 sec exposure started at 20:11:44 UT, 14-AUG-07 and showed a
    > very bright (about mag 1.5) Lacrosse 5 trail. Shortly after the exposure
    > was finished the satellite quickly faded and I lost track of it in the
    > bright city sky of mine. But on a second photo I took at 20:12:37 UT it
    > showed up as a very weak trail at least 3 mag less than before. It must
    > have disappeared at about 20:12:15 UT. Checking with the times that
    > Oleinikoff Nikolay found (and assuming that this disappearance is intrinsic
    > to the satellite and doesn't depend on the observer) it would mean that it
    > dissappeared on that pass every two minutes.
    > Gerhard HOLTKAMP
    > Darmstadt, Germany
    > 49.8822N,  8.6558E
    > -------------------------------------------------------------------------
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