From: Russet McMillan
Subject: 3.5m Night Log 990718
Date: Mon, 19 Jul 1999 06:02:54 -0600 (MDT)
                           SUNDAY JULY 18, 1999
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Gillespie       Ciani, Bhatia,     Shack-Hart 7/18-19  04:00  04:25
                Morgan
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
EN03/S     21:49  04:31  3.9  1.4   0    0   0.4   0    0    0    0
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Observing specialist: R. McMillan
Tonight's scheduled programs (NM06, UW09, and PU02) were pre-empted in
an attempt to get some more Shack-Hartmann time after being almost
completely clouded out for the last three nights.  Tonight the weather
was again very unstable, but we managed to get nearly half an hour of
time in the evening twilight, and a more valuable twenty minutes
through clouds in the morning.
Around 03:30, while we were waiting for the humidity to drop, Jeff
Morgan and I noticed that axis B of the tertiary had just begun to
return "not a full step" error messages just a few minutes earlier.
We did some experiments and were able to confirm that the axis moved
when commanded, despite the error messages.  Homing the three actuator
axes just once, from a starting position of 0, was enough to clear up
the problem -- although we still don't know why it shows up so
intermittently.
                            OBSERVER COMMENTS
                                FOCUS LOG
                              JULY 18 1999
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
#First temp is air, second temp is telescope.
                                 WEATHER
                               JULY 18 1999
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    59    54      5   189  (S)      813   mstly cldy   none
     17:01    62    52      4   210  (SSW)    816   mstly cldy   none
     18:01    59    49      4   119  (ESE)    855   mstly cldy   none
     19:01    61    54      7   221  (SW)     871    ptly cldy   none
     20:01    57    50      6   175  (S)      870   mstly cldy   none
     21:01    56    50     14   130  (SE)     937   mstly cldy   none
     22:01    57    42     11   164  (SSE)    638    cloudy      rain
     23:01    51    51     12   163  (SSE)    132    cloudy      rain
     00:01    48    47     17   183  (S)      526    cloudy      rain
     01:01    52    43     18   141  (SE)     532    cloudy      none
     02:01    51    44      7   184  (S)      443    cloudy      none
     03:01    50    46      0   108  (ESE)    893   mstly cldy   none
     04:01    52    45      6   181  (S)      655   mstly cldy   none
     05:01    51    45      6   193  (SSW)    660   mstly cldy   none
note: the wind was coming from the azimuth listed.  The convention
used is north=0 degrees, east=90 degrees.  The dust count is particles
> 1 micron per 0.1 cu. ft.
                             TELESCOPE STATUS
Primary, secondary, and tertiary mirrors in place and collimated.
Primary support system operational.  Mirror ventilation system in
place.  Telescope drives operational.  Current Remark version: 2.55b5.
Current guide software version: GIm Ctrlv3.0b27.
- Russet McMillan