differential magnitudes good to 3 percent

[Stupendous Man <richmond@a188-l009.rit.edu>]

  With lots of good advice from Arne, I'm cranking through Glenn's
Dayton dataset.  My goal has been to reduce the night-to-night
scatter from the level of 0.10 mag to something like 0.02 or 0.03 mag.
That will make finding variables easier, and yield more information
about them.

  Mike G. told us earlier today that improved flatfielding 
can yield scatter this small (or smaller) in the V-band.  Rah!
After putting the existing Dayton data through the wringer, I
can also get night-to-night scatter of about 0.03 magnitudes.
See the additions to Technical Note 41:

        http://a188-l009.rit.edu/tass/technotes/tn0041.html

  Tomorrow, I'll put the I-band data through this same procedure,
and then start to pick off the variables.  My goal is to produce
a table of variables (cross-correlated against the lists provided
by Arne and others), and a few nice plots -- some known variables,
and I hope a new one or two. 

  Will I get it done in time for the AAS meeting?  I leave on
Saturday morning ... 

  I've learned a lot in the past few days.  After I shall have
returned from the AAS meeting, it will be time to consider how
to put some of this re-calibration into the database ... or at least
allow one to do a job outside the database in a timely fashion.

  Speaking of the database, the stuffing continues.  I'm up to
about 2.35 million entries in "tass_cat", and some larger number
of detections in "observ".  So perhaps another 36 hours will finish
the job.  I hope.

                                       Michael Richmond