From: Russet McMillan
Subject: 3.5m Night Log 20010416
Date: Tue, 17 Apr 2001 05:31:30 -0600 (MDT)
                        APACHE POINT OBSERVATORY
                        3.5m Telescope Night Log
                        Monday, April 16th, 2001
                                                          ACTUAL
 ASTRONOMER    OBSERVER(S)             INSTRUMENT      START  FINISH
 --------------------------------------------------------------------
 S.Hawley      N.Silvestri             DIS-high        19:14  23:14
   INST        SCHEDULED     WEATH     EQUIP     OBS     DAY  NOTUSED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 UW02/R      20:30 05:35   4.3  2.1   0    0   2.7   0    0    0    0
  note: scheduled times listed include instrument change time
                 ------------- ACTIVITY LOG --------------
 1st half Observing Specialist: Jack Dembicky
 Opened louvers / cooling fans turned on at 17:30.  Opened enclosure at
 19:50.
 I turned off the telex/intex fans and closed the louvers at 21:00 and
 turned the press fans on due to increasing dust levels. I turned the
 press fans off at 22:05.  The seeing was variable and moved considerably
 during the first half of the night.
 I closed the enclosure due to high winds and dust at 23:14.
 2nd half Observing Specialist: Russet McMillan
 A cold front moved in rather enthusiastically and dust, wind, and
 humidity were all a problem for a while.  The wind at ground level
 kicked up enough dust to set off the precipitation sensor.  After the
 wind and dust dropped, the humidity remained too high to open.  FIT
 experienced a complete connectivity failure, but we decided there was
 no point worrying about it in such weather.
         --------------- INSTRUMENT FOCUS LOG ----------------
                                       Air/Truss   Wind
 Time   Instrument   Focus     Az El    Temp-C    Dir MPH  filt   FWHM"
 ----------------------------------------------------------------------
 20:15  DIS-slit -110(1002)    13 67   11.9/14.1   49   9  none  1.24
 20:25  NA2gdr  -998(55001)    13 67   12.0/13.9   40   9  none  1.07
 21:45  DIS-slit   20(1140)  -161 38   10.3/11.9   76  19  none  1.86
 22:17  DIS-slit  260(1380)  -152 35   10.2/11.3   80  19  none  1.80
              ------------- WEATHER CONDITIONS ------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:01    67    17      4   270  (W)     1279    Clear   none
     17:01    66    18     14   286  (WNW)   1117    Clear   none
     18:01    61    14      5   285  (WNW)   1163    Clear   none
     19:01    57    12      0   254  (WSW)   1281    Clear   none
     20:01    52     8      4    22  (NNE)   1359    Clear   none
     21:01    52    21     18    70  (ENE)   1801    Clear   none
     22:01    51    26     16    84  (E)     2060    Clear   none
     23:01    49    23     24    72  (ENE)   2181    Clear?  Wind
     00:01    43    38     29    67  (ENE)   5652  ptly cldy Wind and Dust
     01:01    42    39     30    76  (ENE)   4842  ptly cldy Wind and Dust
     02:01    40    39     26    72  (ENE)   3159  mstly clr none
     03:01    40    39     17    77  (ENE)   2260  mstly clr none
     04:01    39    38     14    88  (E)     1742  mstly clr none
     05:01    37    36      8   124  (SE)     753  mstly clr 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.