Unknown 09 August 2005

From: Greg Roberts (grr@iafrica.com)
Date: Wed Aug 10 2005 - 11:39:00 EDT

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    Observations 09 Aug 2005:
    --------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    MINTRON low light level CCD surveillance camera (0.005 lux typical
    in non integration mode) and 0.00005 lux in STARLIGHT mode with 128
    frame integration.
    
    Used with 145mm focal length f/2.5 lens. Integrated for 64 frames
    so equivalent exposure is 1.28 seconds.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude  33.94058 deg S,
    Elevation 10 metres - situated in Pinelands (Cape Town), South Africa
    
    Another UNKNOWN ? :
    -----------------------------
    
    91039 05 221LEO 0433 E 20050809173152200 56 15 2037294-315912 39  +075 05
    91039 05 221LEO 0433 E 20050809173153400 56 15 2038105-320450 39  +075 05
    91039 05 221LEO 0433 E 20050809173154700 56 15 2038599-321211 39  +075 05
    91039 05 221LEO 0433 E 20050809173156000 56 15 2039442-321823 39  +075 05
    91039 05 221LEO 0433 E 20050809173157300 56 15 2040353-322601 39  +075 05
    91039 05 221LEO 0433 E 20050809173158500 56 15 2041233-323214 39  +075 05
    91039 05 221LEO 0433 E 20050809173159900 56 15 2042082-323820 39  +075 05
    
    
    Notes:
    --------
    (1) Cannot find a match for this in my element database updated last
        night. Looks like the inclination is about 62.5 degrees and RA
        Node about 53 degrees. Height of satellite when seen was about 1500
        kilometres so the standard magnitude works out at around +6.8
        It was brighter than #91037 which still remains unidentified but
        is not the same object as the RA Node is considerably different.
        (I could be talking rubbish here so open to correction :-))
    
    (2) Still busy measuring - looks like about 60 satellites tracked, some
        of which are strays.
    
    (3) The memorable event of the evening was the pass of TIPS - the
        brightest Ive ever seen it and the overall impression was that the
        tether was visible the entire pass and never fainter than mag +7.5
        and brightest at +5.0!   This was a zenith pass with the satellite
        at perigee.
    
    (4) I used the MINTRON camera with the settings previously mentioned,
        ie ELC at max and AGC at max. However, whilst this produces pretty
        pictures when the sky background is reasonably dark, the image
        becomes pretty poor/useless at low elevations with a bright sky
        background, so next time will have to try different settings as
        some of the interesting geostationary satellites are low down in
        my sky.
    
    (5) I hope to report the remaining observations tomorrow when
        finished measuring - still have 21+ to measure.
    
    Cheers
    Greg
    
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