Date: Fri, 9 Jan 1998 07:08:36 -0700 (MST)
From: Karen Gloria
Subject: 3.5-m obslog 980108
                         THURSDAY JANUARY 8, 1998
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                    ACTUAL
ASTRONOMER   INSTRUMENT   DATE   START FINISH
Morgan         guider    1/8-9   19:30 05:39
 INST        SCHEDULED      OBS      WEATH     EQUIP   DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
EN01/R     18:41 05:39   1.6  8.4   0   0.8   0   0.2   0    0    0
(note: times listed include instrument change time)
                               ACTIVITY LOG
(* means a trouble report has been issued or appended to)
The telescope was opened at 19:30 MST.  Opening was delayed by
clouds.  Charles Corson was the observing specialist for the first
half of the night.  Jeff Morgan was the observer conducting
engineering tests on the guider.
Jeff conducted several tests, including open and closed loop guiding,
closed loop guiding into the wind, and precision of very small telescope
offsets.
The macintosh for the guide camera hung once.  This resulted in a
brief down time.
			     OBSERVER COMMENTS
Jeff Morgan: "Its been a very good night overall.  We have made some
significant progress in understanding some of the operational problems
with the current guider code.  We have managed to complete 4 of 6
tests that we were hoping to get done.  And we made one series of
tests we did not originally think of (it came to me as we started off
the night).  Its clear that the guide code needs to be modified to
alleviate its extreme sensitivity to drifts away from its expected
centroid position.  This is probably the cause of 90% of the failed
centroid position error that we are currently getting."
                                FOCUS LOG
                             JANUARY 8 1997
                  Best   Telescope           Wind            Seeing
Time   Inst      Focus    Az  El    #Temp   Dir MPH  filter  FWHM "
- no focus data -
#The first temp is air, the second is truss, both in degrees Celsius
                                 WEATHER
                             JANUARY 8 1997
                                   Wind
    Time  Temp F  Dewp. F  MPH.	  Dir.       Dust    Sky        Precip.
     16:01    26     9     15     1  (N)      170  mstly cldy    none
     17:01    25     5     13    25  (NNE)    118  mstly cldy    none
     18:01    27    -2     12    13  (NNE)     68  mstly cldy    none
     19:01    26    -1      9     4  (N)       24  mstly cldy    none
     20:01    28     2      6     1  (N)       78  ptly cldy     none
     21:01    32   -23     15   348  (NNW)     56  ptly cldy     none
     22:01    29    -4     10   357  (N)       65  ptly cldy     none
     23:01    32   -35     12   325  (NW)      53  ptly cldy     none
     00:01    26     6     12   352  (N)      106  ptly cldy     none
     01:01    25     6      9   307  (NW)     187   cirrus       none
     02:01    26     7      7   297  (WNW)     89   clear        none
     03:01    26     8      9   319  (NW)      86   clear        none
     04:01    26     7      8   355  (N)       91   clear        none
     05:01    25     8     12   331  (NNW)    105   clear        none
     06:01    25     2     15   347  (NNW)    107   clear        none
     07:01    26     1     14   345  (NNW)     97   clear        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: 2.36.
Current guide software version: GIm Ctrlv3.0b11.
-Karen