Update 26 Dec 2008 for unknowns

From: Greg Roberts (grr@telkomsa.net)
Date: Sat Dec 27 2008 - 12:57:47 UTC

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    Observations 24/25/26 Dec 2008 Part 1
    ---------------------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    Camera mount now carries two systems that can be operated
    together as two totally different sytems and computers used.
    Generally the DSI Pro II camera will be used for high altitude
    slow moving objects. Tests seem to indicate that its sensitivity
    is comparable to the MINTRON ( possibly better) but as its not
    possible (?) to time stamp to better than 1 second accuracy the
    time resolution is not good enough for LEO objects.
    
    
    (2)Meade DSI Pro II Monochrome CCD camera without filters.
    using integration times of 20 sec min to 60 seconds maximum
    depending on brightness of sky in particular area.No image
    processing done but dark field applied.
    Used with 200mm focal length f/2.8 Nikkon telephoto lens,
    field of view 1.88 x 1.40 degrees. Can get to magnitude 13
    or so in less than 20 seconds exposure.
    Exposure time to nearest second inserted into image FITS header
    from PC clock which is automatically checked every minute against
    GPS signal.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude -33.94058 deg,
    Elevation 10 metres-situated in Pinelands (Cape Town),South Africa
    
    UNKNOWNS:
    ---------------------
    
    91132 08 859GEO 0433 E 20081226191231000 56 15 0320518+052219 39  +130 05
    91132 08 859GEO 0433 E 20081226192323000 56 15 0331446+052246 39  +130 05
    91132 08 859GEO 0433 E 20081226200136000 56 15 0409538+052521 39  +125 05
    91132 08 859GEO 0433 E 20081226201049000 56 15 0419051+052612 39  +125 05
    91132 08 859GEO 0433 E 20081226220516000 56 15 0613240+053331 39  +110 05
    91132 08 859GEO 0433 E 20081226221125000 56 15 0619313+053349 39  +110 05
    91132 08 859GEO 0433 E 20081226225847000 56 15 0706497+053640 39  +120 05
    91132 08 859GEO 0433 E 20081226230152000 56 15 0709536+053655 39  +120 05
    
    91133 08 860A   0433 E 20081224223551000 56 15 0848566+052223 39  +110 05
    91133 08 860A   0433 E 20081224223633000 56 15 0849383+052210 39  +110 05
    91133 08 860A   0433 E 20081226185118000 56 15 0511437+052034 39  +105 05
    91133 08 860A   0433 E 20081226184158000 56 15 0502234+052017 39  +120 05
    91133 08 860A   0433 E 20081226185451000 56 15 0515169+052030 39  +105 05
    91133 08 860A   0433 E 20081226205054000 56 15 0711358+052159 39  +105 05
    91133 08 860A   0433 E 20081226205135000 56 15 0712173+052211 39  +105 05
    91133 08 860A   0433 E 20081226230935000 56 15 0930371+052256 39  +115 05
    91133 08 860A   0433 E 20081226231343000 56 15 0934455+052246 39  +115 05
    
    91134 08 860B   0433 E 20081224223551000 56 15 0849331+052242 39  +105 05
    91134 08 860B   0433 E 20081224223633000 56 15 0850151+052248 39  +105 05
    91134 08 860B   0433 E 20081226185118000 56 15 0512266+051840 39  +105 05
    91134 08 860B   0433 E 20081226185451000 56 15 0516002+051829 39  +105 05
    91134 08 860B   0433 E 20081226205054000 56 15 0712163+052114 39  +105 05
    91134 08 860B   0433 E 20081226205135000 56 15 0712570+052125 39  +105 05
    91134 08 860B   0433 E 20081226230935000 56 15 0931156+052346 39  +110 05
    91134 08 860B   0433 E 20081226231343000 56 15 0935244+052343 39  +110 05
    
    91136 08 860C   0433 E 20081225002154000 56 15 0550523+052727 39  +105 05
    
    Notes:
    --------
    
    (1) Im too tired to do any more measuring today so here are only the
        positions for unknowns observed last night
    
    (2) For 91132 we have good orbits from Ted and Scott- the satellite is
        about midway between the two respective predicted positions which are
        seperated by approximately 2.5 arc minutes. The satellite is pretty
        faint but when observed at a phase angle of about 20 degrees it is easy
        and shows very slight variability of less than perhaps 0.2-0.3
        magnitudes.
    
    (3) #91133 and #91134 are geostationary satellites close to one another
        and quite bright and steady. These two objects are not moving to any
        significant amount so are not drifting and would appear to have a mean
        motion of close to 1.0027 and inclination close to zero degrees. I have
        not seen any magnitude variation so far so dont think they are DSP
        objects - more likely at least one is a DSCS satellite. They lie just
        west of BONUM 1 and for me at azimuth 52.91, elevation 34.7 degrees
        so probably too far east for Peter to observe.
    
    (4) #91136 was found on Dec 25- I only got one position and it was lying
        just east of EXPRESS 3A so in range of Peter.My bearing was az 315.63
        elevation 40.03. I was UNABLE to find it last night so it looks like a
        fast drifter or maybe it happened to be crossing the declination for 0
        degrees inclination so I need to try and see it again at about the same
        time I saw it on Dec 25 - but 2.20am local time is a time I usually
        prefer to be sleeping!
    
    (5) I will continue measuring obs from 24th Dec and 26th Dec tomorrow.
    
    Cheers
    Greg
    
    
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