Date: Thu, 23 Apr 1998 06:45:10 -0600 (MDT)
From: Karen Gloria
Subject: 3.5-m obslog 980422
                         WEDNESDAY APRIL 22, 1998
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Hoopes           Hoopes               DIS     4/22-23  21:07 04:56
 INST        SCHEDULED      OBS      WEATH     EQUIP   DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
NM02/R     21:07 04:56   7.5  0.3   0    0    0    0    0    0    0
(note: times listed include instrument change time)
                               ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Dan Long was the telescope operator for the first half of the night.
The observer was Charles Hoopes for NM02.  There were no major
problems.  The guide camera control software crashed/hung three times
during guiding.  Seeing was a bit worse than average.  I based my dust
closure limit on combined readings from the enclosure and tower dust
monitors.  This made a big difference on the amount of time the
telescope was open.  The enclosure monitor is located near the primary
mirror.  It's reading was about 1/2 to 2/3 that of the tower monitor,
depending on enclosure and wind direction.  Some dust was visible down
in the basin.  None visible in my flashlight beam.  A tough call.
			     OBSERVER COMMENTS
Charles Hoopes (NM02) - "It was a great night of observing. There were
no problems that cost any time on the sky.
The DIS red-chip readnoise is back up to 25 electrons. It was down to
11 two months ago. There is also banding in the bias."
                                 FOCUS LOG
                               APRIL 22 1997
                  Best   Telescope           Wind            Seeing
Time   Inst      Focus    Az  El   #Temp    Dir MPH  filter  FWHM "
23:30 guider 51000(6042)  33  72  7.2/7.6   171  11    R      1.6
02:45  DIS    150(    )  309  60  7.7/6.5   198   3   none    1.5
#The first temp is air, the second is truss, both in degrees Celsius
                                 WEATHER
                              APRIL 22 1997
                                   Wind
    Time  Temp F  Dewp. F  MPH.	  Dir.       Dust     Sky       Precip.
     16:01    56    18     13   231  (SW)    1844    clear       none
     17:01    51    18      9   223  (SW)    1537    clear       none
     18:01    53    18      8   217  (SW)    1532    clear       none
     19:01    51    17     10   232  (SW)    1609    clear       none
     20:01    48    17      4   190  (S)     1723    clear       none
     21:01    47    16      5   188  (S)     1733    clear       none
     22:01    45    16     13   145  (SE)    1948    clear       none
     23:01    45    16     10   157  (SSE)   1940    clear       none
     00:01    44    16     10   152  (SSE)   1870    clear       none
     01:01    42    18     12   128  (SE)    1988    clear       none
     02:01    44    17      0   245  (WSW)   1980    clear       none
     03:01    46    17      6   200  (SSW)   1805    clear       none
     04:01    48    15      1   165  (SSE)   1936    clear       none
     05:01    43    18      5   169  (SSE)   1978    clear       none
     06:01    45    19     12   183  (S)     1708    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: 2.39.
Current guide software version: GIm Ctrlv3.0b11.
-Karen