RE: Unidentified Satellite

From: Bob Christy (rdc@zarya.info)
Date: Sat Oct 29 2005 - 07:09:37 EDT

  • Next message: Alberto Rango: "4641 Satobs 28 Oct 2005"

    Hello All
    
    The element set in my original message (reproduced below) was derived from
    radio observations. Peter Wakelin has since observed a satellite in a
    similar orbit and has produced the following element set:
    
    1 90027U 04841A   05298.82021647 0.00000000  00000-0  00000-0 0    00
    2 90027  62.4213 174.5679 6901062 267.6805  339.6809 2.00630906    09
    
    Revisiting the radio observations confirms that rise and set times are
    consistent with this orbit. It may now be possible to identify the
    satellite.
    
    The following data points exist:
    
    RAAN of "Unknown 041206" From Mike McCants' classified file -    2005 May
    7.0: 194.2 degrees
    RAAN of the NROL-1 Centaur from an element set by Mike McCants - 2004 Sep
    1.0: 233.0 degrees
    
    Calculating back from Peter's new element set, I make the equivalent values
    at the above dates 196.6 degrees and 228.3 degrees.
    
    Given the inclination of our unidentified and of "Unknown 041206" being 62.4
    degrees, and the fact that USA-179 made a slight inclination change after it
    separated from the Centaur, I believe that we are looking at multiple views
    of the same object.
    
    A reasonable conclusion is that our unidentified satellite is
    USA-179/NROL-1.
    
    Regards
    Bob Christy
    
    
    > -----Original Message-----
    > From: Bob Christy [mailto:rdc@zarya.info] 
    > Sent: 19 October 2005 21:20
    > 
    > 1 80000U 05000A   05278.68515000  .00000000  00000-0  00000-0 0  0001
    > 2 80000  63.4000 172.0000 7108823 279.5000 180.0000  2.00599011 00001
    > 
    
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