Date: Mon, 3 Nov 1997 06:34:52 -0700 (MST)
From: Charles Corson
Subject: 3.5m obslog 971102
                         SUNDAY NOVEMBER 2, 1997
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                    ACTUAL
ASTRONOMER   INSTRUMENT   DATE   START FINISH
Richards	DIS	 11/02  18:15  05:00
 INST        SCHEDULED      OBS      WEATH     EQUIP   DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UC01/S     18:35 04:59    9.8  0.6   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)
Clear skies and light winds prevailed throughout the evening.
Gordon Richards and Chris Mallouris observed tonight, QSO survey.
The night was again, very productive.
Of interest, Gordon noted a distinct shift in the spectral
sensitivity as measured using the same standard star and
IRAF's sensfunction.  The break occured at about 3:00am.  If one
looks at the  skymin/skymax statistics reported from ERIC DEUTSCH's
cloudcam page, one also sees a distinct shift in the trend at
3:00am.  No clouds were noticable.  If the sensitivity numbers are
understood, the decrease in sensitivity was on the order of about
10-12%, at 5000Angstroms, and uniform throughout the blue passband.
A much smaller effect is seen in the red passband, but not uniform.
                                FOCUS LOG
                             NOVEMBER 1 1997
                  Best   Telescope           Wind            Seeing
Time   Inst      Focus    Az  El    #Temp   Dir MPH  filter  FWHM "
18:12   DIS    -50(6466) 73   38    6.5/7.7  345  6   r       1.45
01:50   Gdr    -75(6240) 193  48    4.1/4.2  26   8   r       1.2
#The first temp is air, the second is truss, both in degrees Celsius
                                 WEATHER
                              NOVEMBER 1 1997
                                   Wind
    Time  Temp F  Dewp. F  MPH.   Dir.       Dust    Sky          Precip.
     16:01    42     5      7   352  (N)      514    clear        none
     17:01    41     4     11     3  (N)      449    clear        none
     18:01    44    -3     15     7  (N)      175    clear        none
     19:01    43     2     19   357  (N)      232    clear        none
     20:01    41     2      5     7  (N)      276    clear        none
     21:01    41     4      3   311  (NW)     302    clear        none
     22:01    42     7      6     0  (N)      370    clear        none
     23:01    41     9     10   357  (N)      363    clear        none
     00:01    41     5     13   339  (NNW)    353    clear        none
     01:01    40     8     16    18  (NNE)    398    clear        none
     02:01    40     8     11    27  (NNE)    362    clear        none
     03:01    41     6      6     6  (N)      367    clear        none
     04:01    36     8      2    35  (NE)     409    clear        none
     05:01    38     7      8   312  (NW)     409    clear        none
     06:01    37     8      3   319  (NW)     435    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.
Charles