From: Russet McMillan
Subject: 3.5m Night Log 20070410
Date: Wed, 11 Apr 2007 06:23:54 -0600 (MDT)
                         Apache Point Observatory
                         3.5m Telescope Night Log
                         Tuesday, April 10, 2007
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)          INSTRUMENT        START  FINISH
 -------------------------------------------------------------------
 S.Anderson      S.Anderson           SPIcam            19:30  20:30
 G.Kacprzak      G.Kacprzak           SPIcam            03:15  06:20
  INST     SCHED(TWILIGHT)   WEATH     EQUIP     OBS     DAY  NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B   USE   D    B
 ---------------------------------------------------------------------
 UW03/R     20:24  01:00   4.6   0    0    0    0    0    0    0    0
 NM06/R     01:00  05:44   1.9  0.4   0    0    0   2.4   0    0    0
   note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: R.McMillan
 High winds and high dust in the afternoon improved a little near
 sunset.  Dust counts were hovering just below the limit; when I
 decided to open, they crept above the limit.  By the time we had
 focused and determined the seeing was nearly unusable, dust was high
 enough to make me uncomfortable.  We closed just before a real dust
 spike started.
 Dust remained high for the rest of first half.  When it dropped to
 acceptable levels around 02:30, orographic clouds were too thick to
 permit even focusing.  We eventually got focused through some holes
 in the clouds, then observed through some other holes, and finally
 it cleared up nicely after about 04:30.
 Focus values were rather strange in the evening, as shown in the
 focus log; this might reflect the large temp swing from last night
 to the beginning of tonight, or the limited ventilation time before
 we first opened, or possibly an incorrect fan state when we focused
 the first time.  I was running the fans in non-standard
 configurations to cope with dust.
                       ------- FAILURE LOG -------
  PROG   INST   FAILURE MODE     TIME
       (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
 ----------------------------------------------------------------------
               ---------------- FOCUS LOG ---------------
 Time  Instrument  Focus    Az  El  Temp Strc Prim  Sec  Air  filt FWHM
 ----------------------------------------------------------------------
 20:25 SPIcam    150       153  66   7.0                        i  2.5
 03:20 SPIcam  -175(-102)  164  56   2.0  2.61 2.78 2.88 2.09   r  1.01
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    -------------------------------------------------------------------
     16:00    50    20     23   271    (W)   3636  ptly cldy   dust
     17:00    51    19     15   257  (WSW)   3903  ptly cldy   dust
     18:00    50    15     40   308   (NW)   3764  ptly cldy   dust
     19:00    48     8     24   311   (NW)   2462  ptly cldy   none
     20:00    46     5     12   325   (NW)   3126  ptly cldy   none
     21:00    43    26     16   281    (W)   8346 mstly clr    dust
     22:00    41    25     19   286  (WNW)   8436  ptly cldy   dust
     23:00    41    24     20   275    (W)   7276  ptly cldy   dust
     00:00    40    14     23   297  (WNW)   4897 mstly clr    dust
     01:00    38     0     14   322   (NW)   4676  ptly cldy   dust
     02:00    36    -2      2   132   (SE)   3141 mstly cldy   none
     03:00    36    -3     15   328  (NNW)   2689 mstly cldy   none
     04:00    35    -1      6   279    (W)   2281  ptly cldy   none
     05:00    34     0     19   331  (NNW)   2030    clear     none
     06:00    33    -1     15     1    (N)   1586    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: 2.9.0
      Current TUI version: TUI 1.3