Disk 18j

[Tom Droege <tdroege@veriomail.com>]

I notice the long exposures on disk 18j are smeared out e-w.  One more 
thing to work on.  Looks like 8 pixels or so FWHM for a 200 second exposure.

I think things will never be perfect, so the software should do the best it 
can to make use of less than optimum data.  Of course I will work to make 
the data better, and all Mark IV operators will.  But if one waits for 
perfect data then we will never get a survey done, I fear.

I think we should try to take perfect data.  I think we should then grade 
the result in some way.  This means a program that looks at the data frame 
by frame and puts an entry in a master catalog somewhere.  At the very 
least this needs to be done for clouds.  There are nights with good 
conditions otherwise where the cloud cover may be 10-20%.  One gets lots of 
good frames between clouds.

Once we have such a master catalog, we could then pull out frames meeting 
some criteria.  We could as well mark star lists by frame, with some 
indication of quality.  Note that this is a reason to keep source frame 
information with each measurement.   Not knowing anything about how data 
bases are organized, I would do this by source frame or star list by 
frame.  There may be a better way.

Tom Droege