Re: [TASS] photometric vs. non-photometric

[Chris Albertson <chrisja@jps.net>]

Andrew Bennett wrote:
>

> But my personal opinion is that the scatter in the
> number of accepted magnitude determinations is too
> great and extends to sources which are too bright
> to be accounted for by variations in seeing. If
> you can think of a way to check on this without
> going to the original images, please tell us.

A few ideas...

Some of this _is_ likely due to matching errors.
Currently the match algorithm does not look at
magnitude, color or anything other then location
in the sky.  You could try to hunt down the bad
matches.  Next question is how.

Crowding may be effecting us.  You could try to look
at number of detections as a function of distance to
the nearest star.

If the VCO is off the stars will streak in the east
west direction.  Stars with a close star to the
east or west would only be detected if the VCO were
set perfectly.  If can not be set perfectly because one
VCO controls all three cameras and there is some
drift in the VCO.

>
> Andrew Bennett, Avondale Vineyard, Nova Scotia, Canada.

--
   --Chris Albertson             home: chrisja@jps.net
     Redondo Beach, California   work: calbertson@logicon.com