From: Russet McMillan
Subject: 3.5m Night Log 20040425
Date: Mon, 26 Apr 2004 05:30:19 -0600 (MDT)
                          Apache Point Observatory
                          3.5m Telescope Night Log
                           Sunday, April 25, 2004
                                                          ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 G.Richards      G.Richards             DIS            20:10  22:38
 A.West          A.West                 DIS            22:39  01:02
 J.Tumlinson     J.Tumlinson            DIS            01:03  05:15
  INST        SCHEDULED      WEATH     EQUIP     OBS     DAY  NOT USED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 ---------------------------------------------------------------------
 PU06/R      20:38  22:38   0    0    0    0    0   2.0   0    0    0
 UW02/R      22:38  01:00   0    0    0    0    0   2.4   0    0    0
 UC03/R      01:00  05:24   0    0    0    0   3.8  0.6   0    0    0
  note: scheduled times listed include instrument change time
                 ------------- ACTIVITY LOG --------------
 Observing Specialist: R.McMillan
 A range of lower and high-altitude clouds, while weaker and stronger
 east winds played havoc with the seeing.  The observer for PU06
 mentioned that the DIS biases looked very nice.  I had difficulties
 getting the guider to recognize stars on some occasions due to a
 variety of software problems and also one instance of excessive hot
 pixels near the beginning of the night (guider temp at start of
 night, -15C; near twilight, -25C).  Also discovered an interesting
 crosstalk between the nighttime exhaust fans and the hygrometer for
 the daytime pressurization fans.
                          ------- 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
 ---------------------------------------------------------------------
 20:26 DISslit     50(1246)    44  75  8.4/9.9    32   15   -     1.7
 20:32 NA2gdr    -2768(44231)  42  75  8.3/9.7    37   12   Clear 1.2
                ------------- WEATHER LOG ----------------
                                  Wind                       Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
     ------------------------------------------------------------------
     16:01    50    10      8   300  (WNW)   1254  mstly clr   none
     17:01    50    10     12   352  (N)     1247  ptly cldy   none
     18:01    51    11     11   308  (NW)    1211  ptly cldy   none
     19:01    50    13      6     4  (N)     1193  ptly cldy   none
     20:01    48    13     11    30  (NNE)    972  ptly cldy   none
     21:01    47    14      8    57  (NE)     907  ptly cldy   none
     22:01    44    15     17    75  (ENE)   1082  ptly cldy   none
     23:01    40    25     21    66  (ENE)    915  ptly cldy   none
     00:01    39    24     20    70  (ENE)    837  mstly clr   none
     01:01    39    23     19    73  (ENE)    887  mstly clr   none
     02:01    39    22     18    70  (ENE)    884  ptly cldy   none
     03:01    37    23     21    67  (ENE)    859  ptly cldy   none
     04:01    35    21     21    71  (ENE)    708  ptly cldy   none
     05:01    35    18     25    64  (ENE)    623  ptly cldy   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
     Telescope drives operational. Current Remark version: 2.85b
     Current guide software version: guider v4.1b4
     Current TCC version: 2.7.2  Current TUI version: TUI-0.843