Date: Mon, 23 Nov 1998 07:12:13 -0700
From: "John W. Briggs"
Subject: 2.5m obslog 981122, MJD 51140
Sunday, Nov. 22, 1998 (MJD 51140)
Apache Point Observatory SDSS 2.5-m
Observing Log
	Lupton and Annis on camera; Briggs running telescope.  Opened at
sunset, but heavy cirrus to about 02:30.  Seeing generally about 1.5
arcsec, improving towards dawn.  Annis reports on camera operations and
ongoing focus control (galil) problems:
>We had the usual galil problems: loss of communications
>with the galil, and having to home the galil more than once.
>
>We lost ad3 twice tonight to the bus error problems.
>
>The last run, 308, is probably photometric with seeing of 1.1-1.2".
>It starts at low latitude and heads high. It is a 100,0,
>except that is is shifted a full ccd to the South.
>
>It is clear that we need to solve both the galil problems
>and ad3 problems before we next run, otherwise we merely waste our time.
	The west door and limit are functional, but the limit switch
"feeler" requires adjustment and probably a change-out to a longer one for
improved operation.  Operators: keep an eye on the limit as you run the
door.  The MPC required rebooting before I could log in from the enclosure
laptop and bed telescope.  Dan Long's Mac crashed once during the night,
leading Lupton to comment that if running XTERM windows via a Mac for
operations leads to too many crashes, then we should avoid using a Mac as
an interface.  The telescope did not home to the azimuth stow position, but
I found  home easily enough with the "J,K" manual slow motions in the Menu
program.
	Although the 2.5-m is a finicky devil, it's clear that things get
easier with it after a few nights experience.
	Morning zodiacal light was quite brilliant today; gegenschein was
obvious several days ago.
			--J. W. Briggs.
********************************************************************
John W. Briggs
University of Chicago Engineering Center,
Yerkes Observatory
[Deployed at] Sloan Digital Sky Survey          Voice:  505-437-6822
              Apache Point Observatory          Fax:    505-434-5555
              Sunspot, NM 88349