Updated axis for IR20

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Hi All,

Frank Reed wrote:

> Subsequently Rob Matson has collected observation data of bright flashing
> episodes of this satellite and from his analysis has estimated the position
> of the spin axis to be approximately RA = 4.45 hours, Dec = +29.25.

Just an update on the spin axis for Iridium 20 (aka 18) #24871.  I've got a
better fit to all the observational data using RA = 4.4395 hours, Dec = 29.78.
One of the MMAs has a normal tilted 38.85 degrees to this axis, with a
standard deviation of 0.93 degrees.  --Rob

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