From: Russet McMillan
Subject: 3.5m Night Log 20031129
Date: Sun, 30 Nov 2003 06:47:57 -0700 (MST)
                         Apache Point Observatory
                         3.5m Telescope Night Log
                        Saturday, November 29, 2003
                                                          ACTUAL
 ASTRONOMER     OBSERVER(S)             INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 D.York         J.Barentine             DIS            17:45  00:00
 J.Frieman      G.Richards,J.Hennawi    DIS            00:10  06:02
  INST        SCHEDULED      WEATH     EQUIP     OBS     DAY  NOT USED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 ---------------------------------------------------------------------
 UC04/O      17:54  00:00   0    0    0    0   0.8  5.3   0    0    0
 UC08/R      00:00  05:49   0    0    0    0   5.8   0    0    0    0
 note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 1st Half Observing Specialist: J.Barentine
 Open by 17:30 this afternoon to cool after checkout and getting a round
of dome-dark DIS cals.  Bill called early in the evening to brief me on
the 2dry actuators situation such that I'd know what to look for if
anything went awry.  Nothing of note until a fairly big jump in the image
position on the DIS slitviewer occurred around 21:30, but after an
exposure was in progress.  No adjustments to focus or slit position.
didn't notice anything odd in the mirror status.  Shift was mainly in
altitude.  Magnasensors showed some readings in the 20-ish arcsecond
range.
 During a science exposure just short of 23:00 I noticed harmonic
vibration of loads cells A nd B on the dataq, along with similar vibration
on the traces of the two drive motors (but not the rotator).  I commented
to Russet about how we were pointed into the wind at the time, but it
looked more like the motors may have been inducing oscillations in the
primary.  It all damped out within a couple of minutes, but promptly came
back shortly thereafter.  The amplitude and modulation of the noise on the
load cells changed on a scale of seconds, suggesting wind.  During this
time I made many updates of the position of my object on the DIS slit;
the direction the field was moving corresponded to azimuth, but the moves
were small.  Once we were clear of the meridian, the guiding became better
behaved.
 2nd Half Observing Specialist: R.McMillan
 Second half was mostly clear and peaceful, with good seeing.  Once
 we left the high-altitude object at the end of first half, the
 telescope behaved very well aside from one failure of mirror covers
 under automatic.  No trouble with the secondary actuators in this
 nice warm weather.  The focus behavior of DIS tonight was similar to
 last night, perhaps related to the holding current on the secondary
 actuators -- but it didn't seem to be having too much impact on
 image quality.
                     ------- 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
 ---------------------------------------------------------------------
 17:54 DISslit     -100(890)   192 75  7.3/8.2    347  8    -     0.81
 17:58 NA2gdr      694(44694)  196 75  7.3/8.1    353  2    R     0.85
                 -------------- WEATHER LOG ----------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
     ------------------------------------------------------------------
     16:01    46    -3      7     2  (N)       53  MstlyClr    none
     17:01    45    -4      6   358  (N)       62  MstlyClr    none
     18:01    46    -4      6   340  (NNW)     61   Clear      none
     19:01    46    -3     16   343  (NNW)     73   Clear      none
     20:01    46    -1      8    13  (NNE)     69   Clear      none
     21:01    47    -1      8   343  (NNW)     68   Clear      none
     22:01    46    -1     20   348  (NNW)     63   Clear      none
     23:01    47     0      5     9  (N)       95   Clear      none
     00:01    46    -1     20     9  (N)       94   Clear      none
     01:01    45    -3     12    10  (N)       88   clear      none
     02:01    45    -5     24    17  (NNE)     89   clear      none
     03:01    44     6     16    15  (NNE)     40   clear      none
     04:01    44    18     16     7  (N)       62  mstly clr   none
     05:01    43    22     26    21  (NNE)     42  mstly clr   none
     06:01    43    24     24    34  (NE)      47   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
   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-0.76