From: Russet McMillan
Subject: 3.5m Night Log 20010429
Date: Mon, 30 Apr 2001 06:28:58 -0600 (MDT)
                        APACHE POINT OBSERVATORY
                        3.5m Telescope Night Log
                        Sunday, April 29th, 2001
                                                          ACTUAL
 ASTRONOMER    OBSERVER(S)             INSTRUMENT      START  FINISH
 --------------------------------------------------------------------
 M.Strauss     X.Fan,V.Narayanan       DIS-Low         21:25  00:55
 J.Friedman    D.Johnston,G.Richards   DIS-Low         01:08  05:10
   INST        SCHEDULED     WEATH     EQUIP     OBS     DAY  NOTUSED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 PU02/R      20:41 01:00    0   0.7   0   0.1   0   3.5   0    0    0
 UC02/R      01:00 05:19    0    0    0   0.1  3.3  0.9   0    0    0
  note: scheduled times listed include instrument change time
                 ------------- ACTIVITY LOG --------------
 Observing Specialist: Russet McMillan
 Threatening clouds and rain nearby kept us closed until 21:25, when
 we opened.  Seeing was poor (1.6-2.2 arcsec) and clouds continued to
 hamper observations for the first hour or so of observing.  Shortly
 before midnight, the wind changed, the humidity plummeted, and the
 seeing improved to about 1.3 arcsec (but variable).  During second
 half the humidity popped up again and seeing rose to >2 arcsec.
 I took a few minutes at the changeover to make another comparison of
 the DIS instrument focus vs. the slitviewer focus.  Yesterday, in
 partly cloudy conditions, I found the instrument focus higher than
 the slitviewer.  Tonight, in clear conditions but extremely variable
 seeing, I found the instrument focus lower than the slitviewer.  I
 think this means they are as consistent as they can be within the
 limitations of the weather right now.
 The telescope and instruments behaved well.  A source of noise on the
 slitviewer may have been fixed -- we'll be watching for its return.
         --------------- INSTRUMENT FOCUS LOG ----------------
                                       Air/Truss   Wind
 Time   Instrument   Focus     Az El    Temp-C    Dir MPH  filt   FWHM"
 ----------------------------------------------------------------------
 21:29 DISslit    -250(880)   183 58  8.6/12.0   136  13   -     1.71
 21:32 NA2gdr     -884(55115) 185 58  8.7/11.9   136  13   none  1.60
 00:59 DISslit    50(1134)    226 52  10.6/10.6  191  9    -     1.15
 01:08 DIS(red)   -25(1060)   229 51  10.3/10.5  267  7    -     1.43
 01:09 DIS(blue)  -25(1060)   229 51  10.3/10.5  267  7    -     1.79
              ------------- WEATHER CONDITIONS ------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:01    61    37     24   226  (SW)     740  mstly cldy   none
     17:01    60    31     21   240  (WSW)    865  mstly cldy   none
     18:01    55    38     12   178  (S)      999  mstly cldy   none
     19:01    54    36     10   199  (SSW)   1084  mstly cldy   none
     20:01    52    37     12   189  (S)     1062  mstly cldy   none
     21:01    48    38     14   136  (SE)     676   ptly cldy   none
     22:01    48    36     12   142  (SE)     706   ptly cldy   none
     23:01    49    30      6   188  (S)      759   mstly clr   none
     00:01    52    16     16   222  (SW)     759   mstly clr   none
     01:01    51    21     10   216  (SW)     810   mstly clr   none
     02:01    49    25     11   217  (SW)     758    clear      none
     03:01    45    33      2   113  (ESE)    845    clear      none
     04:01    45    34      3   108  (ESE)    767    clear      none
     05:01    47    32      1   191  (S)      761    clear      none
     06:01    47    23      7     7  (N)      977    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
  > 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.