[amsat-bb] Re: DO-64 observation

James Duffey JamesDuffey at comcast.net
Tue Aug 12 16:48:17 PDT 2008

Rick - I think that they use a permanent magnet aligned with the long  
axis of the satellite. When it goes over the magnetic poles, the  
permanent magnet (an the satellite) flip to follow the magnetic field  
lines. Say the North end of the magnetic is the leading end of the  
satellite as it ascends from equator to the pole. WHen it goes over  
the pole, the north end of the satellite becomes the trailing edge as  
the satellite descends form the pole to the equator. Slick. - Duffey
On Aug 11, 2008, at 12:50 PM, Rick Mann wrote:

> On Aug 11, 2008, at 06:12:56, wouter weggelaar wrote:
>> As Delfi-C3 goes over the earths poles, it flips itself 180 degrees  
>> in
>> Z axis (perpendicular to earth). Otherwise one side will be always
> Are you saying it has an active attitude control that it uses to
> change orientation right as it crosses the poles? Or is the satellite
> rotating with a period equal to that of its orbit?
> TIA,
> -- 
> Rick
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James Duffey
Cedar Crest NM

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