Re: USA 193 non-observation

From: John Locker (john@satcom.freeserve.co.uk)
Date: Tue Jul 17 2007 - 02:48:06 EDT

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    Not seen the night sky for five weeks here Ted...........continual white out 
    !
    
    ..............but 193 remains top of  my list.
    
    Rumour is weather will improve.........................in September !
    
    John
    
    
    ----- Original Message ----- 
    From: "Ted Molczan" <sslmolcz@rogers.com>
    To: <SeeSat-L@satobs.org>
    Sent: Tuesday, July 17, 2007 12:35 AM
    Subject: USA 193 non-observation
    
    
    > On 2007 Jul 16, at 07:18:08 UTC, I observed that 06057A failed to appear 
    > as
    > predicted.
    >
    > Predicted magnitude was 4.0. Based on the latest magnitude scatter 
    > diagram, the
    > object has been observed on occasion to be some 3.5 mag fainter at that 
    > phase
    > angle, so it could have been as faint as mag 7.5.
    >
    > I was observing in a clear patch of sky, using 25x100 binoculars, and 
    > could see
    > easily to mag 8.5 or 9. One of my two reference stars was mag 8.5 and 
    > stood out
    > clearly.
    >
    > I observed from site 2701: 43.68764 N, 79.39243 W, 230 m. 06057A was 
    > predicted
    > to exit penumbra at 07:17:56 UTC, near 14:12, +58:11 (2000.0). I was 
    > looking at
    > 07:18:08 UTC, near 13:26, +63:16 (2000.0). Azimuth was 334 deg; elevation 
    > 25.
    > Phase angle was 1.9 radians. I started about 40 s before the pass, and 
    > waited 2
    > min after.
    >
    > According to Pierre Neirinck, 6 hours earlier, Alberto Rango also did not 
    > see
    > it, but I am unclear as to the reason. He may have skipped it due weather 
    > or
    > local obstructions. If it was a no-show, then that may be significant in 
    > light
    > of my non-obs. I will pass on any clarification that I receive.
    >
    > The satellite reportedly ceased to function soon after launch, so it would 
    > not
    > be expected to manoeuvre. Most likely, it just happened to be unusually 
    > faint on
    > my pass - I have experienced this more than once with the larger KeyHole
    > satellites.
    >
    > That said, until it is seen again, observers may wish to consider 
    > beginning a
    > search in the event it fails to appear on the coming nights.
    >
    > Ted Molczan
    >
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