From: Russet McMillan
Subject: 3.5m Night Log 20050503
Date: Wed,  4 May 2005 06:15:42 -0600 (MDT)
                        Apache Point Observatory
                        3.5m Telescope Night Log
                          Tuesday, May 3, 2005
                                                         ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 D.York          B.Woodgate,V.Kulkarni  GFP            --:--  --:--
 B.Woodgate      B.Woodgate,C.Grady     GFP            01:00  06:05
  INST     SCHED(TWILIGHT)   WEATH     EQUIP     OBS     DAY  NOT USED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 ----------------------------------------------------------------------
 UC04/O      20:45  01:00  4.3   0    0    0    0    0    0    0    0
 DD02/O      01:00  05:15   0    0    0    0   3.2  1.1   0    0    0
  note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: R.McMillan
 At sunset, we had a thunderstorm approaching across the basin.  Much
 of it had dissipated by the time it reached APO, but we did get a
 little rain.  After that, it took a few more hours for the humidity
 to drop and the clouds to thin out, then we opened just before
 01:00.  Seeing was poor at first, but decent once we started to
 catch up with the telescope's cooling curve.  We got some good data
 despite the occasional passing wave of clouds.
 During the cloudy time, I continued pursuing the question of scatter
 in the April 22nd pointing model.  Backlash in the altitude drive
 looks like a plausible suspect.
                      ------- FAILURE LOG -------
  PROG   INST   FAILURE MODE     TIME
      (SEGDFNVO)    TI/SHU   START  FINISH  DESCRIPTION
 -----------------------------------------------------------------------
                ---------------- FOCUS LOG ---------------
                                        Air/Truss   Wind
 Time   Instrument   Focus     Az  El    Temp-C    Dir MPH  filt  FWHM
 ---------------------------------------------------------------------
 01:27 gfp         -450(839)   157 30  3.6/4.8    360  5    6563  1.38
 04:39 gfp         0(1225)     207 28  3.9/3.1    284  9    R     1.56
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
     ------------------------------------------------------------------
     16:01    55    30     11   226  (SW)     663  ptly cldy   none
     17:01    52    27     12   237  (WSW)    711  ptly cldy   none
     18:01    45    28      9   243  (WSW)    717  mstly cldy  none
     19:01    40    32     14   293  (WNW)   3718   cloudy    rain,dust
     20:01    40    28      3   273  (W)      880   cloudy     lt. rain
     21:01    37    32     16    61  (ENE)   1170   cloudy     none
     22:01    39    31      5    12  (NNE)    576   cloudy     none
     23:01    37    32     10    60  (ENE)    654  mstly cldy  none
     00:01    38    32      6   359  (N)      552  ptly cldy   none
     01:01    39    30      1   352  (N)      530  ptly cldy   none
     02:01    37    29      2   356  (N)      568  ptly cldy   none
     03:01    38    29     12   351  (N)      537  ptly cldy   none
     04:01    39    29     15   308  (NW)     767  mstly clr   none
     05:01    39    28     10   296  (WNW)    695   clear      none
     06:01    39    29      9   271  (W)      657   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 TCC version: 2.7.2  Current TUI version: TUI 0.94