From: Russet McMillan
Subject: 3.5m Night Log 20080425
Date: Sat, 26 Apr 2008 06:12:39 -0600 (MDT)
                        Apache Point Observatory
                        3.5m Telescope Night Log
                         Friday, April 25, 2008
                                                         ACTUAL
 ASTRONOMER      OBSERVER(S)             INSTRUMENT    START  FINISH
 -------------------------------------------------------------------
 T.Thuan         T.Thuan,Y.Izotov        DIS           20:45  01:03
 G.Wallerstein   K.Kinemuchi             DIS           01:07  05:55
   INST     SCHED(TWILIGHT) WEATH     EQUIP      OBS     DAY  NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B   USE   D    B
 ---------------------------------------------------------------------
 UV01/R     20:38  01:05   0.1   0    0    0   4.0  0.4   0    0    0
 UW12/R     01:05  05:24    0    0    0    0    0   4.3   0    0    0
  note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialists: R.McMillan
 Dust was high around sunset, but dropped somewhat afterwards.  I
 tried opening when the dust got below 5000 and found that the
 interior dust stayed below the limit, possibly because the wind was
 very light.  The night was clear with good, stable seeing.
 After considerable work on the azimuth drives during the day, Nick
 found that the lubricant for the main bearing had become
 contaminated.  It was flushed and replaced, and I was on the lookout
 for trouble tonight.  I did have to measure velocity scales twice
 (579 at afternoon checkout, 583 at midnight changeover), but
 otherwise it behaved well.  There was a brief scare when we saw some
 guiding/tracking problems mostly in the az direction, but then I
 realized the guide star was an asteroid.  With a more appropriate
 choice, tracking and guiding were excellent (so was pointing).
 At UT 04:57:18, there was a rotator controller error in the middle
 of a slew which halted the other axes sharply.  It recovered after
 an init and only a couple of minutes were lost.
                       ------- FAILURE LOG -------
  PROG   INST   FAILURE MODE     TIME
      (SAEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
 ----------------------------------------------------------------------
               ---------------- FOCUS LOG ---------------
 Time  Instrument  Focus    Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
 -----------------------------------------------------------------------
 19:56 dis-slit   -11(   62) 193  67   9.1  9.7  9.7  9.2  9.0      1.20
 22:08 dis-slit    -2(   -3)   1  56   8.0  8.0  8.4  7.2  7.7      1.20
 00:28 dis-slit    45(   15) -72  66   8.1  7.5  8.0  7.4  7.9      1.10
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    -------------------------------------------------------------------
     16:00    50     3      2   269    (W)   8667    clear     dust
     17:00    51     4      7   284  (WNW)   8332    clear     dust
     18:00    51     4      4   258  (WSW)   7101    clear     dust
     19:00    48     1     12    31  (NNE)   6605    clear     dust
     20:00    46     0     15    44   (NE)   5962    clear     dust
     21:00    48     2     11    11    (N)   4776    clear     none
     22:00    47     0      8   337  (NNW)   4709    clear     none
     23:00    47     1      9   299  (WNW)   3933    clear     none
     00:00    46     1      7   275    (W)   4040    clear     none
     01:00    47     2     10   266    (W)   4240    clear     none
     02:00    46     1     11   262    (W)   4322    clear     none
     03:00    46     1      7   263    (W)   4217    clear     none
     04:00    45     1      6   262    (W)   4134    clear     none
     05:00    44     0      8   264    (W)   4234    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 TCC version: 2.9.1
      Current TUI version: TUI 1.4.5