Re: North Korea satellite: NOTAMs inconsistent withclaimedsun-synchronous orbit

From: Brian Weeden (brian.weeden@gmail.com)
Date: Sun Apr 08 2012 - 19:46:02 UTC

  • Next message: Jonathan McDowell: "Re: North Korea satellite: NOTAMs inconsistent withclaimedsun-synchronous orbit"

     All sun-sync are retrograde, but not all retrograde are sun-sync.
    
    There may not be a accepted international definition inscribed in a treaty
    somewhere, but there is precise mathematical definition and that's good
    enough for me:
    http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/37900/1/04-0263.pdf
    
    Sure, being off by a few fractions of a degree in inclination is not a huge
    deal, but in the case of North Korea (which is what started this
    discussion) the inclination based on their announced azimuth isn't even
    retrograde.
    
    ---------
    Brian
    
    
    
    
    On Sun, Apr 8, 2012 at 3:27 PM, Bob Christy <bob@zarya.info> wrote:
    
    > I agree absolutely. I made a similar point a few days ago, immediately
    > after Ted's original analysis of the potential inclination (scroll down
    > to the "Trajectory" heading):
    > http://www.zarya.info/Gallimaufry/Kwangmyongsong3.php
    >
    > Bob Christy
    >
    > On 08/04/2012 19:57, Jonathan McDowell wrote:
    > > ..........In the absence of an accepted international definition it's a
    > matter of taste what the
    > > tolerance should be. And for the North Koreans, if their satellite only
    > works for
    > > a couple of weeks, say, then you only care how much the local time
    > drifts during that
    > > period.
    > >
    > >   - in the spirit of friendly pedantic argument,
    > >         Jonathan
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