RE: Some photo's of USA 202 and the FIA Radar 1 in the sky

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sun Oct 17 2010 - 18:43:00 UTC

  • Next message: Marco Langbroek: "SATOBS ML (4353),17 Oct 2010 (Pt. II): USA 129"

    Marco Langbroek wrote:
    
    > I have put some pictures shot last night up on this URL:
    >
    > http://sattrackcam.blogspot.com/2010/10/again-fia-radar-1-nrol-41.html
    >
    > It concerns amongst others a nice trail image of the FIA Radar 1
    > (10-046A) crossing the 'W' of Cassiopeia: and the USA 202 (Mentor 4)
    > geostationary (09-001A) hanging in the sky some 4 degrees below Jupiter.
    
    Interested readers can get a sense of the intrinsic brightness of the geosynchronous Mentors, by
    clicking to enlarge the second image from the top. Mentor 4 was shining at about mag 8.0, at a range
    of ~39500 km - without the benefit of flaring. The two trailed stars in close proximity are mag 8.4
    and 8.6.
    
    Mentor is among the intrinsically brightest objects that have been in orbit; the following is a
    partial list. Magnitude is normalized to 1000 km range, 90 deg phase angle.
    
    ISS                    LEO      -1.3 (2003-05)
    Shuttle                LEO       0.2
    Mentor                 GEO       1.2
    Magnum                 GEO       1 - 1.5? (only obs were at low phase angle)
    Mir Complex            LEO       1.6 (1991-95)
    Skylab                 LEO       1.7 (based on few obs)
    Lacrosse 5             LEO       2.5
    Mercury                GEO       2.7
    Titan Centaur          Various   2.8
    Milstar                GEO, LEO  3
    Delta IV 5m 2nd stage  GEO       3.3
    Rhyolite               GEO       3.5
    Lacrosse 1 thru 4      LEO       3.6
    Trumpet                MOL       3.6
    FIA Radar 1            LEO       3.8
    IGS Radar              LEO       3.8
    Zenit 2nd stage        LEO       3.9
    UARS                   LEO       4.0
    
    Ted Molczan
    
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