Re: GRACE Satellites

From: Daniel Crawford (djcunix@scc.net)
Date: Thu Apr 25 2002 - 23:14:47 EDT

  • Next message: Tom Wagner: "The GRACEs"

    Beautiful site tonight of subject objects.  Both were brightest objects in
    Northern sky for several seconds and faded out to near invisible at zenith.
    I could not find them with 7X50's as they crossed close to zenith.
    
    What is making the "glint"/"baby flare" :) ? Could the moon be a factor?
    ----- Original Message -----
    From: "Matson, Robert" <ROBERT.D.MATSON@saic.com>
    To: "'Tony Beresford'" <aberesford@iprimus.com.au>; <seesat-l@satobs.org>
    Sent: Thursday, April 25, 2002 7:19 PM
    Subject: RE: GRACE Satellites
    
    
    > Hi All,
    >
    > Tony wrote:
    >
    > > You cant get a sunglint off a nadir pointing surface in LEO,
    > > except within a few degrees of the local horizon. This was
    > > discussed on this list a few years ago.
    >
    > Quite so.  Looking at the dozens of images of the GRACE pair,
    > I don't see any way to get a glint off the spacecraft unless
    > it is improperly oriented.  Check the image gallery:
    >
    > <http://www.csr.utexas.edu/grace/gallery/other/IABG/>
    >
    > The trapezoidal ends were the only hope, and unfortunately their
    > normals are perpendicular to nadir, which means glints could
    > only occur during daytime.
    >
    > --Rob
    >
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