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Barry,
Proxima according to Wiki moves about 3775 milliarcsec/ yr in RA
and 769 mas/yr in Dec.
That's by no means the largest proper motion of a star.
Barnard's star is one of the fastest moving. 10,300 mas/ yr!
There is also motion due to our movement contributing to the picture,
mainly the cyclic wobble.
My DSI CCD at this image scale is approx 11 x 14 arc mins in scale and
approx 1.14 arc sec per pixel.
Steve
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