Re: DSP flashes (corrections)

From: Rainer Kracht (R.Kracht@t-online.de)
Date: Sun Mar 09 2003 - 06:37:55 EST

  • Next message: Tony Beresford: "March 9 observation"

    On 8 Mar 2003, at 21:33, Rainer Kracht wrote:
    
    > Last night I captured 14 flashes from the European DSP (DSP 20)
    > from 22:50:03.2 - 22:50:13.8 UTC with the Mintron 12V1C-EX and
    > lens 75 mm f/1.3 through thin clouds. An image is at
    > 
    > http://home.t-online.de/home/R.Kracht/flashes.htm
    > 
    > The brightest flashes are about mag 7. But they last only
    > for about two minutes each night.
    > 
    First flash was at 2003 Mar 07 22:50:03.2 UTC
    Last flash                     22:52:13.8
    
    The integration time for one frame was 1.28 seconds.
    The FP is about 102*1.28/13 = 10.0 seconds.
    
    The brighter flashes look like mag 7 stars in the single
    frames in which they appear. But the flash duration is
    much shorter than 1.28 seconds. So I have wrongly
    compared a short (perhaps 0.1 or 0.2 seconds) flash with
    star images integrated for 1.28 seconds! The true
    magnitude of the flashes is about mag 5.
    
     Rainer
    
    
    
    Rainer Kracht
    Elmshorn, Germany
    Station 5005
    53.7695N 9.6626E  9m Potsdam Datum
    53.7679N 9.6614E 47m WGS84
    R.Kracht@t-online.de
    
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