ARNE's drive

[<aah@nofs.navy.mil>]

A couple of additional interesting plots:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/tass/dec.gif
shows the change in declination (X) centroid position of
the star BP Vul as a function of time (frame number).
You can see that the pole of the mount does not point
to the NCP, as you get a nice variation in the position
as the drive passes through the meridian.
Likewise,
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/tass/ra.gif
shows the variation in Right Ascension (Y) centroid.
This is a linear change, probably indicative mostly
of drive tracking rate error.  Still, pretty smooth,
so the tangent arm works well over a 2.5hr interval.
  Now, how far do I have to move the mount to get
it aligned?
Arne