Re: Milstar 5 video obs

From: Rainer Kracht (
Date: Sat Mar 01 2003 - 05:23:12 EST

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    On 28 Feb 2003, at 15:15, Greg Roberts wrote:
    > >Date: Thu, 27 Feb 2003 00:33:44 +0100
    > >From: (Rainer Kracht)
    > >To:
    > >Subject: Milstar 5
    > >observations with my new video camera (Mintron 12V1C-EX)
    > >f=75 mm, f/1.3
    > Hi Rainer,
    > Very pleased to see that someone else has now started to make use
    > of a sensitive video camera for satellite tracking - the Mintron
    > is a nice unit but a little too expensive for me unfortunately.
    > Did you use the camera in the integrating mode in order to reach
    > magnitude 10.7? - I would not have thought it capable of going 
    > that faint in video mode as there is no way I could reach that
    > faint. Im using a 1004x camera f=82mm, f/1.6 and this can reach 
    > about +9.4 in good conditions with my bright city lit sky.
    > Willie Koorts tried his new 1004x ccd camera on a 9 inch reflector
    > and was able to reach about magnitude +12 in video mode - ie about
    > 1/50th second exposure.
    > Hope to see more people making using of video cameras as this is
    > the way to go !
    > Good luck
    > Greg
    My city lit sky is also quite bright, I think the naked eye limiting
    magnitude was about mag 3 for the Milstar videos. The exposure time
    was set to 20 ms and the integration to 64x giving a total exposure
    time of 1.28 seconds per frame (0.78125  fps). The camera was fixed
    (no guiding).
    The pixel size of the Mintron (Sony) CCD is 0.008 x 0.008 mmm.
    With the 75 mm lens this corresponds to 22 arcseconds (1.47
    seconds of time at the celestial equator).
    The field of view is a comfortable 4.9 x 3.7 degrees.
    This is a small, easy to use and powerful device.
    Rainer Kracht
    Elmshorn, Germany
    Station 5005
    53.7695N 9.6626E  9m Potsdam Datum
    53.7679N 9.6614E 47m WGS84
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