Re: Light Curve from Satellite Trail

From: Björn Gimle @GlocalNet (@GlocalNet)
Date: Thu Jan 10 2008 - 18:41:56 UTC

  • Next message: Alberto Rango: "4542 PPAS 06 - 12 DEC 2007."

    Without knowing the exact layout, IMHO any satellite with a large
    antenna/panel monted on some boom outside the spacecraft
    can get into an attitude where we see the dark backside of
    the panel, and/or the panel shadows the satellite.
    
    Likewise, more or less box-shaped satellites can in some
    attitudes display only shadowed surfaces to the observers,
    and there may be no large protrusions that cast even
    secondary light onto these surfaces.
    
    Just my 5c
    
    /Björn
    
    ----- Original Message ----- 
    From: "John Locker" <john@satcom.freeserve.co.uk>
    To: <SeeSat-L@satobs.org>
    Sent: Thursday, January 10, 2008 6:05 PM
    Subject: Re: Light Curve from Satellite Trail
    
    
    > On that page , Phil says...
    >
    >
    > "A sudden brightening, then a drop of 5 magnitudes then a final flare."
    >
    > Which is more or less how I observed L 5 when I took a series of images at 
    > the end of last May
    >
    > http://mysite.wanadoo-members.co.uk/satcom_transits/Lstrip.jpg
    >
    > The flare as it returned was quite distinct , before it faded again
    >
    > To me this says  one of two things...either L5 rotates to make itself 
    > "invisible" ...or it has a mechanical device that shields it.
    > Question is , why only go into stealth mode for short periods ?
    >
    > John
    >
    >
    >
    >
    > ----- Original Message ----- 
    > From: "Bob Christy" <rdc@zarya.info>
    > To: "'Allen Thomson'" <thomsona@flash.net>; "'Seesat-L'" 
    > <SeeSat-L@satobs.org>
    > Sent: Thursday, January 10, 2008 3:36 PM
    > Subject: RE: Light Curve from Satellite Trail
    >
    >
    >>I used different software for this one, a rather handy web-based 
    >>application
    >> called "Google".
    >>
    >> See:
    >> http://www.zen32156.zen.co.uk/disappearencs.htm
    >>
    >> Bob
    >>
    >>> -----Original Message-----
    >>> From: Allen Thomson [mailto:thomsona@flash.net]
    >>> Sent: Thursday, January 10, 2008 3:04 PM
    >>> To: Bob Christy; 'Seesat-L'
    >>> Subject: RE: Light Curve from Satellite Trail
    >>
    >> ............... Also a Lacrosse 5 fade
    >>
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