Date: Sun, 25 Oct 1998 05:06:15 -0700
From: long@apo.nmsu.edu (Dan Long)
Subject: 2.5m obslog 981024
                         SATURDAY OCTOBER 24, 1998
                     APACHE POINT OBSERVATORY SDSS 2.5m
                              OBSERVING  LOG
   Last night the camera was warmed and pumped on so that it might hold for
the next week.  Tonight started out fairly promising.  We opened ( for the
first time in a week ) at about 20:00 when the humidity had lowered enough.
Skies were clear.
   We got parked on the equator at the meridian and started taking data.
Star images were extremely distorted with two peaks about 2 arcseconds
apart and a diffuse blob off to one side.  We had time to go to zenith,
relax the primary with several setmir downs and ups, and return to the
equator.  No change was seen from this.  Next we tried homing the secondary
and moving back.  This didn't change anything either.  Our next step was to
home the primary.  Unfortunately we didn't get to do this, as the humidity
went back up, forcing us to close at about 22:15.  We did not reopen.
There was fog starting around midnight and lasting the rest of the night.
   For the record the mirror parameters during this were
Primary Galil:    6350  -5800   900  -5700  45200  45200
        setmir:      0  -26.3  30.7   1675    350
Secondary Galil:  1770900  1850900  2008100  -11000 -18000
          setmir     1490     -217        0       0    134
   Providing we can open tomorrow, we will attempt homing the primary and
see if that clears up the problem.  If it doesn't, there may be something
wrong with the primary support system.  A cursory check didn't show
anything.  Pressures for the system are fine as measured at the racks.
                                    Dan