RE: Goes 11 retired from service

From: Dale Ireland (direland@drdale.com)
Date: Wed Dec 07 2011 - 23:41:03 UTC

  • Next message: ronlee@pcisys.net: "Phobos Grunt obs, 8 Dec 2011, 0020Z, Falcon, CO US"

     
    Thanks Robert
    That is just what I was wondering about. If the Moon or Sun tend to raise
    the orbits at that distance. I guess that anyone who follows the regular
    orbit adjustments for the active satellites might know if they are usually
    raised or lowered. That may be an over-simplification.
    Dale
    
    > -----Original Message-----
    > From: seesat-l-bounces+direland=drdale.com@satobs.org 
    > [mailto:seesat-l-bounces+direland=drdale.com@satobs.org] On 
    > Behalf Of Robert Fenske Jr
    > Sent: Wednesday, December 07, 2011 3:02 PM
    > To: seesat-l@satobs.org
    > Subject: RE: Goes 11 retired from service
    > 
    > 
    > The geosynchronous orbits are high enough that atmospheric 
    > drag isn't a factor.
    > Only the lunar and solar perturbations are and they must 
    > simply be not enough to move a satellite into the operation 
    > orbit range.  Or perhaps at that distance the perturbations 
    > have a tendency to move the satellite even further away from 
    > the Earth.
    > 
    > I don't know why a higher orbit is chosen vs a lower one.  
    > Since the manuevers are done at the end of life -- when there 
    > is little fuel remaining -- often it is chancy whether the 
    > push to the graveyard orbit can be done.  It may be that a 
    > push to a high orbit takes less energy and so is more likely 
    > to succeed.
    > 
    > Robert Fenske, Jr
    > 
    > On Wed, 7 Dec 2011, Dale Ireland wrote:
    > 
    > > Why is the "graveyard" 135 miles higher than the active 
    > satellites? If 
    > > the satellite becomes totally unoperational won't it 
    > eventually drop, 
    > > possibly uncontrolled, back down through the geo belt? Why wouldn't 
    > > they make the graveyard 135 miles lower than the belt rather than 
    > > higher? Are there other forces involved?
    > > Dale
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