From: Russet McMillan
Subject: 3.5m Night Log 20030205
Date: Thu,  6 Feb 2003 06:34:09 -0700 (MST)
                         Apache Point Observatory
                         3.5m Telescope Night Log
                        Wednesday, February 5, 2003
                                                          ACTUAL
 ASTRONOMER     OBSERVER(S)             INSTRUMENT     START FINISH
 -------------------------------------------------------------------
 P.Szkody       P.Szkody,N.Silvestri    DISII.5        --:--  --:--
   INST        SCHEDULED     WEATH     EQUIP     OBS     DAY  NOTUSED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 UW04/R      18:34  06:00  8.2  3.3   0    0    0    0    0    0    0
 note: scheduled times listed include instrument change time
                  ------------- ACTIVITY LOG --------------
 1st half Observing Specialist: J.Barentine
 Overcast skies and high winds around sunset prevented opening.  Toward
midnight the skies began to clear gradually and the dewpoint dropped very
slowly.
 2nd half Observing Specialist: R.McMillan
 Humidity dropped quite suddenly after midnight, and the clouds began
 to break up.  Patchy orographic clouds persisted for several hours,
 then finally cleared off completely after 04:00 at the same time that
 the wind dropped to less than 5 mph.  I called the observer at 04:25
 and she felt that she wouldn't be able to make use of the short
 amount of time remaining.
 I considered opening for throughput measurements, but the conditions
 were disturbingly similar to those under which I got graupel on the
 primary mirror a few weeks ago.  I went up to double-check the
 catwalk and perhaps the hatchway, and while I was on the catwalk snow
 blew down from the roof onto my face.  Under the circumstances, I
 didn't feel it was safe to open despite the apparently perfect sky
 conditions.
                        ------- FAILURE LOG -------
 PROG   INST   FAILURE MODE     TIME
      (SEGDFVO)    TI/SHU   START  FINISH  DESCRIPTION
 -----------------------------------------------------------------------
                 ---------------- FOCUS LOG ---------------
                                        Air/Truss   Wind
 Time   Instrument   Focus     Az  El    Temp-C    Dir MPH  filt  FWHM
 ---------------------------------------------------------------------
              --------------- WEATHER LOG ----------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
     ------------------------------------------------------------------
     16:01    29    21     19   221  (SW)     305  Overcast     none
     17:01    29    18     27   262  (W)      484  Overcast     none
     18:01    29    19     22   246  (WSW)    425  Overcast     none
     19:01    29    21     22   262  (W)      183  Overcast     none
     20:01    28    22     16   231  (SW)     167  Overcast     none
     21:01    27    26     18   241  (WSW)    376  Overcast     none
     22:01    27    27     22   267  (W)     7319  Overcast     none
     23:01    26    25     28   238  (WSW)  11616  Overcast     none
     00:01    23    22     13   263  (W)      381  MstlyCldy    none
     01:01    23     9     17   260  (W)      465  mstly cldy   none
     02:01    22     7     16   272  (W)      488  mstly cldy   none
     03:01    20     6     14   332  (NNW)    479  mstly cldy   none
     04:01    19     4      2     0  (N)      528   ptly cldy   none
     05:01    18     4     14   338  (NNW)    458    clear      none
     06:01    18     5     10   337  (NNW)    463    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: 2.82
   Current guide software version: GIm Ctrlv4.1b2
   Current TCC version: 2.6.8