Re: Bird or UNID satellite?

From: Greg Roberts (grr@telkomsa.net)
Date: Thu Nov 15 2012 - 14:18:45 UTC

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    Hi Marco
    
    I have noticed that the WATEC is very good at catching night flying birds - must 
    have just the right spectral response. Im often fooled by birds especially if 
    they just happen to fly in a straight line across the field of view. I have 
    noticed that the birds seem to like occupying a certain part of the sky ... most 
    times they are very bright -- mag +3 or so - make lovely UFO videos!
    
    Cheers
    Greg
    
    ----- Original Message ----- 
    From: "Marco Langbroek" <marco.langbroek@online.nl>
    To: "satelliet lijst (SeeSat)" <SeeSat-L@satobs.org>; "Ted Molczan" 
    <tedmolczan@rogers.com>; "Pierre Neirinck" <pierre-neirinck@wanadoo.fr>; "Bram 
    Dorreman" <bram.dorreman@skynet.be>; "Greg Roberts" <grr@telkomsa.net>; "Philip 
    Masding" <zen32156@zen.co.uk>; "Scott Campbell" <campbel.7@hotmail.com>
    Sent: Thursday, November 15, 2012 1:59 PM
    Subject: Bird or UNID satellite?
    
    
    >
    > Hi all,
    >
    > While setting up my WATEC video system yesterday to monitor a potential 
    > asteroid occultation, and checking the system out on the Pleiades, I recorded 
    > a possible UNID of about mag. +7.5:
    >
    > 00000 00 000X   4353 G 20121114190908670 17 75 0356406+243550 56  +075 10
    > 00000 00 000X   4353 G 20121114190909510 17 75 0354146+248880 56  +075 10
    > 00000 00 000X   4353 G 20121114190909870 17 75 0353098+251250 56  +075 10
    > 00000 00 000X   4353 G 20121114190911030 17 75 0349365+259090 56  +075 10
    >
    > Video:
    >
    > http://sattrackcam.blogspot.nl/2012/11/is-it-bird-or-possible-unid-satellite.html
    >
    > A cautious fit using Scott Campbell's software yields a retrograde orbit:
    >
    > 1 00000U 00000X   12319.79804433 0.08150896  00000-0  50000-4 0    03
    > 2 00000 127.9164  82.0201 0001856 256.4133 195.3316 16.53901902    03
    >
    >       STA  YYday HHMM:SSsss   AZ     EL     ASP     XTRK    deltaT   Perr
    > ( 1) 4353  12319 1909:08670   86.8   29.1   31.2   -0.01     0.01    0.011
    > ( 2) 4353  12319 1909:09510   86.9   29.9   31.9    0.00    -0.00    0.002
    > ( 3) 4353  12319 1909:09870   86.9   30.2   32.3    0.00    -0.01    0.006
    > ( 4) 4353  12319 1909:11030   87.0   31.3   33.3    0.00    -0.00    0.003
    >
    >
    > HOWEVER: an object in such an orbit would be in shadow, and the retrograde 
    > character (plus mean motion) is unlikely too. So perhaps it was a bird, though 
    > usually those are more recognizable.
    >
    > - Marco
    >
    >
    > -----
    > Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
    > e-mail: sattrackcam@langbroek.org
    >
    > Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
    > Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
    > Station (b)log: http://sattrackcam.blogspot.com
    > Twitter: @Marco_Langbroek
    > ----- 
    
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