[vsnet-chat 4153] Re: NSV 5602 is a high proper motion M4 dwarf

[aah@nofs.navy.mil]

You might also check UCAC1 for high-precision modern-epoch
position and proper motion.
  Proper motion is becoming a large problem with my
personal database, just as it is for the PIXY system. I have CCD
data extending over 20 years now, and matching observations
with just an error radius is starting to mismatch a number of stars.
For example, a 1arcsec error radius over 20 years means that
stars with 0.05arcsec/year proper motion will start moving
out of the error circle, and there are lots of such stars.
There was an interesting paper at the San Diego AAS meeting
from the MACHO collaboration, showing that their fixed-position
psf templates yielded photometric results on high proper
motion stars that systematically decreased over time since
the star started to move out of its assigned position.
You could actually tell the direction and amount of
proper motion.
Arne

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