Re: Possible unid sat seen

From: C. Bassa (cgbsat@gmail.com)
Date: Tue May 07 2013 - 20:44:38 UTC

  • Next message: Mark McCarron: "RE: Unidentified Satellites"

    Hi Kevin,
    
    On Tue, May 7, 2013 at 2:10 PM, Kevin Fetter <kfetter@yahoo.com> wrote:
    > Playing back the video, I had a bright sat, at least when it was near the edge of the feild of view, that faded out.
    
    >From your video I measured the following positions:
    99204 13 627A   1775 G 20130507075052417 17 25 1832716-170010 37 S
    99204 13 627A   1775 G 20130507075054333 17 25 1831518-173082 37 S
    99204 13 627A   1775 G 20130507075056350 17 25 1830280-180247 37 E
    99204 13 627A   1775 G 20130507075058317 17 25 1829093-183268 37 E
    
    Going through the classified objects, and allowing for changes in mean
    anomaly (MA) and right ascension of the ascending node (RAAN), it
    seems the SAR Lupe orbits fit these measurements best. SAR Lupe 2
    [31797/07030A] requires only a 1.8 deg change in RAAN, so I believe it
    to be the best candidate. Updating its 283 day old elements for MA and
    RAAN even shows that the fading out you observed is consistent with it
    entering the shadow.
    
    Here is a search orbit for those who want to try to recover it:
    1 99204U          13127.32702971  .00000000  00000-0  50000-3 0    00
    2 99204  98.5657  82.5003 0001000 320.5230 181.4929 15.28459108    07
    
    Regards,
        Cees
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