Re: NROL-41 - search elements for actual launch time

From: Robin R.Wier (rwier@concentric.net)
Date: Wed Sep 22 2010 - 07:18:32 UTC

  • Next message: Robin R.Wier: "Re: NROL-41 - search elements for actual launch time"

    ----- Original Message ----- 
    From: "Phil Karn" <karn@ka9q.net>
    To: "Robin R.Wier" <rwier@concentric.net>
    Cc: <seesat-l@satobs.org>
    Sent: Tuesday, September 21, 2010 11:28 PM
    Subject: Re: NROL-41 - search elements for actual launch time
    
    
    ...................................................................
    > Okay, your bearing to the launch site at 34.6429885N, 120.5885124W
    > (somebody please check me on that) was 204.59 deg.
    
    Very posssible, no dissagreement.
    
    
    > The launch azimuth
    > defined by the NOTAM boxes and corresponding with a 123 deg inclination
    > was 222.3 degrees, 17.71 degrees more to the west. Could it have been
    > that much more?
    NO!
    ..............................................................................................................
    > I don't understand how you arrived at your 1/2 degree figure. Had it
    > flown *directly* away from you, you could reasonably say that it flew a
    > heading close to 204.59 deg, your bearing to the launch site.
    
    It was, for all but the most technical, just that, directly away from me. A 
    very stable set-up, EXTREMELY clear sky. Up (big yellow/orange), just oohs 
    and aahs.  Got interesting after 1st stage burnout. Became nearly stellar, 
    Sirius like, field stars in background flying by. Near 75-80% (guess) time 
    of the obs, the trajectory tops out, and starts going down (visual). Right 
    back down through the same field stars. Relative motion to the background is 
    slowed at this point. Down track MOVING a little right of the up track. I 
    guessed 30' angle, I guess max would be 2 degrees. Up and down, point at 
    top, spreading angle on the way down, guess 30'. Shortly thereafter the 
    blue/white very stellar looking object winks, and is gone.
    
    ............................
    
    
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