From: Russet McMillan
Subject: 3.5m Night Log 20010425
Date: Thu, 26 Apr 2001 06:09:20 -0600 (MDT)
                        APACHE POINT OBSERVATORY
                        3.5m Telescope Night Log
                       Wednesday, April 25th, 2001
                                                          ACTUAL
 ASTRONOMER    OBSERVER(S)             INSTRUMENT      START  FINISH
 --------------------------------------------------------------------
 S.Anderson    S.Anderson,B.Williams   DIS-Low         23:15  00:55
 S.Hawley      N.Silvestri             DIS-Med         01:05  05:55
   INST        SCHEDULED     WEATH     EQUIP     OBS     DAY  NOTUSED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 UW01/R      20:38 01:00   1.2  1.4   0    0   1.8   0    0    0    0
 UW02/R      01:00 05:24    0    0    0    0   4.4   0    0    0    0
  note: scheduled times listed include instrument change time
                 ------------- ACTIVITY LOG --------------
 Observing Specialist 1st Half: Jack Dembicky
 Opened louvers and turned on telescope cooling fans at 16:45 under
 overcast skies. Closed louvers to do DIS cal checkout at 17:30 and
 re-opened the louvers at 18:00. Closed the louvers again at 18:55 so
 enclosure would be dark for observers to do cals.
 We had a dust event occur at 19:00 and the cooling fans were turned off
 and pressurization fans turned on to keep dust out of the enclosure.
 Dust levels dropped below closure limits at around 22:50 and I opened the
 enclosure at 23:05 and got the observers on their way around 23:15.
 Observing Specialist 2nd Half: Russet McMillan
 Second half went smoothly in spite of less-than-perfect weather.  We
 had light cirrus, variable seeing (from 0.8 to 1.6 and back on very
 short timescales), and borderline dust and humidity.  But it was
 never quite bad enough to force us to close, and a lot of targets
 were observed.
         --------------- INSTRUMENT FOCUS LOG ----------------
                                       Air/Truss   Wind
 Time   Instrument   Focus     Az El    Temp-C    Dir MPH  filt   FWHM"
 ----------------------------------------------------------------------
 23:23  DISslit   -210(626)    66  81   6.6/8.2   154  14  none   1.24
 23:25  NA2gdr  2199(58199)    66  81   6.6/8.2   154  14  none   0.90
 01:12  DISslit     0(880)    143  55   5.2/6.3   126  5    -     1.39
              ------------- WEATHER CONDITIONS ------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:01    57    14     14   205  (SSW)    989   Cloudy     None
     17:01    54    21     10   197  (SSW)   1152   Cloudy     None
     18:01    50    25     16   213  (SSW)   1338   Cloudy     None
     19:01    48    31     17   219  (SW)    4764  Pt. Cldy    Dust
     20:01    45    37      6   183  (S)     9582  Pt. Cldy    Dust
     21:01    43    37      7   179  (S)     5418  Pt. Cldy    Dust
     22:01    44    37     11   153  (SSE)   5094  Pt. Cldy    Dust
     23:01    45    31     16   146  (SE)    2259  Pt. Cldy    None
     00:01    44    32     11   173  (S)     1864  Pt. Cldy    None
     01:01    42    35      6   134  (SE)    2134   cirrus     none
     02:01    41    36      8   126  (SE)    2022   cirrus     none
     03:01    41    33      4   147  (SSE)   1444   cirrus     none
     04:01    42    31      1   187  (S)     1158   cirrus     none
     05:01    43    32      3   261  (W)     1251   cirrus     none
     06:01    44    33      2   304  (NW)    1266   cirrus     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
  > 1u per 0.1 cubic feet.
                              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: 2.62. Current
  guide software version: GIm Ctrlv3.0b27. Current TCC version: 2.5.1
  Current MC version: v1_7_3.