From: Russet McMillan
Subject: 3.5m Night Log 20060510
Date: Thu, 11 May 2006 03:21:59 -0600 (MDT)
                        Apache Point Observatory
                        3.5m Telescope Night Log
                         Wednesday, May 10, 2006
                                                         ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 M.Klaene        R.McMillan,J.Battat,   APOLLO,        23:00  02:30
                 S.Snedden              DIS
  INST     SCHED(TWILIGHT)   WEATH     EQUIP     OBS     DAY  NOT USED
 I/ROW/DN    START FINISH   D    B    D    B    D    B   USE   D    B
 ----------------------------------------------------------------------
 EN02/W      20:51  05:07  0.1  4.7   0    0    0   3.5   0    0    0
  note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: Russet McMillan
 The high-priority engineering tasks having been done yesterday, and
 the medium/low-priority tasks requiring better seeing conditions
 than we were anticipating tonight, we ended up doing some pickup
 engineering with APOLLO and pickup science with DIS.  At the same
 time I used the APOLLO video to check tracking/tuning (one small
 adjustment made, otherwise I was limited by seeing as last night),
 and used observations of a spectrophotometric standard to check for
 a return of blue-side contamination on DIS (no sign of it so far).
 While we were working with APOLLO, the wind shifted to the east and
 humidity picked up, and the stars poofed up like pastries.
 Surprisingly, dust dropped at the same time.  Humidity continued to
 rise for the next few hours while DIS was in use.  Since there had
 been very little exposure to dust tonight, I figured it was safe to
 stay open while the humidity climbed, although I did decide to close
 while the dewpoint depression was still more than 1 C from the limit
 (RH 79%).
 I didn't record any focus data because the telescope temperatures
 were never anywhere near equilibrium and the seeing was horrible
 anyway (sometimes over 5 arcseconds).
                       ------- FAILURE LOG -------
  PROG   INST   FAILURE MODE     TIME
       (SEDFNVOG)    TI/SHU   START  FINISH  DESCRIPTION
 -----------------------------------------------------------------------
                ---------------- FOCUS LOG ---------------
                                        Air/Truss   Wind
 Time   Instrument   Focus     Az  El    Temp-C    Dir MPH  filt  FWHM
 ---------------------------------------------------------------------
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:01    59    18     16   293  (WNW)   4538   clear      none
     17:01    59    20      9   297  (WNW)   4007   clear      none
     18:01    58    18      2   288  (WNW)   4397   clear      none
     19:01    56    18      2   312  (NW)    4154   clear      none
     20:01    54    18      5   359  (N)     3927   clear      none
     21:01    55    22      4   285  (WNW)   3743   clear      none
     22:01    53    21      5   259  (W)     4007   clear      none
     23:01    52    22      7   189  (S)     3810   clear      none
     00:01    53    20      6    82  (E)     4577   clear      none
     01:01    44    34     12    78  (ENE)   2827   clear      none
     02:01    39    32     20    75  (ENE)   2091   clear      none
     03:01    35    31     26    73  (ENE)   1747   clear    wind,humid
     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: 2.8.4
      Current TUI version: TUI 1.1