[amsat-bb] Mystery effect correlation?

[beacker@xxxxxxxx]

Folks,
     I was perusing the spin information from the archived
telemetry, orbits 343 thru 352.  There seems to be some set of
forces that are reducing the spin rate by about 10% near
perigee.  And increasing it a bit as the orbit progresses.

	                Orbit    RPM          perigee
	7/29/01 5:52    343      2.30 
	7/29/01 22:58   343      2.49   8%
	
	7/30/01 1:32    344      2.21           -11%
	7/30/01 18:21   344      2.39   8%
	
	7/30/01 20:35   345      2.21           -8%
	7/31/01 22:24   345      2.30   4%
	
	7/31/01 15:31   346      2.92           27%
	7/31/01 23:38   346      3.31   13%
	
	8/1/01 10:59    347      2.70           -18%
	8/2/01 1:54     347      3.05   13%
	
	8/2/01 6:11     348      2.70           -11%
	8/2/01 10:44    348      2.92   8%

	8/3/01 0:42     349      2.70           -8%
	8/3/01 18:32    349      3.00   11%
	
	8/3/01 19:40    350      2.92           -3%
	8/4/01 13:41    350      3.05   4%
	
	8/4/01 14:52    351      2.92           -4%
	8/5/01 7:07     351      3.05   4%
	
	8/5/01 10:18    352      2.49           -18%
	8/5/01 22:39    352      2.81   13%

     I'm not sure if we have any active controlling of the
spin rate in progress.  But it would be interesting to see
if this is a consistent state of affairs where the spin
rate rises thru the course of the orbit, then drops back
as the bird passes thru perigee, to repeat...
          Brad Eacker (beacker@misc.com) KB6FED


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