Date: Wed, 26 Apr 2000 19:41:14 -0600 (MDT)
From: Frank Deglman
Subject: Re: 3.5m Night Log 20000425
> 	I opened at 19:55. When I started DIMM it was not making consistent
> measurements and I checked outside to find the focus was incorrect. I
> refocused and found the flux low.
the temperautre not ony changes seasonally, but also quite a bit on a
daily basis. i think the problem is that we open before the dome and the
scope has cooled back into the previous night's focus.  once focused what
happens later in the night?
> We were using DIS in horizon mode, which proved to be workable but
> still labor-intensive.  The tracking has definitely improved since the
> instrument block problems were fixed.  We confirmed that guiding was
> somewhat easier in most cases with the guider off.
when we do pointing models, the accuracy of the azimuth and altitude are
measured, but not the rotation. and since we have been having problems
with the rotator... could we get this characterized? and i assume this
would involve using new fields of multiple stars.  would it be feasible to
to eventually get this modeled, such as part of tpoint?