From: Russet McMillan
Subject: 3.5m Night Log 20070401
Date: Mon,  2 Apr 2007 06:58:51 -0600 (MDT)
                         Apache Point Observatory
                         3.5m Telescope Night Log
                          Sunday, April 1, 2007
                                                          ACTUAL
 ASTRONOMER      OBSERVER(S)         INSTRUMENT        START  FINISH
 -------------------------------------------------------------------
 E.Hilton        E.Hilton            Agile             19:30  01:02
 T.Murphy        R.McMillan          APOLLO            01:05  01:58
 T.Harrison      T.Harrison          DIS, Echelle      02:10  06:10
  INST     SCHED(TWILIGHT)   WEATH     EQUIP     OBS     DAY  NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B   USE   D    B
 ---------------------------------------------------------------------
 UW02/R     20:17  01:00    0    0    0   0.3   0   4.4   0    0    0
 DD01/O     01:00  02:00    0    0    0    0    0   1.0   0    0    0
 NM05/R     02:00  05:56    0    0    0    0    0   3.9   0    0    0
   note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: R.McMillan
 The night was beautifully clear, with subarcsecond seeing, but
 unfortunately a rather eventful night -- and not only because four
 different instruments were used.
 We had some trouble getting going with Agile: first a question about
 mounting the disk so I could access images, then some mystery about
 lines in the twilight flats that hadn't been there in March (we
 decided it was due to the different filter).  Then it turned out the
 target star was pretty nearly invisible in the U filter, but the
 changes that had been made to the filter slide in order to
 accommodate our 3" filters didn't accept our 2" filter adapters.  I
 had to do some emergency filter-holder surgery to put the BG40
 filter back in the instrument.  It was nearly 22:00 when we finally
 started taking data.  After some consideration, I left the confusion
 parts out of the time accounting and only listed the filter
 difficulties as equipment trouble.
 APOLLO nearly had to give up time due to a spotter no-show, but
 an on-site visitor (thanks, Larry!) graciously consented to fill
 in.  We got returns from one reflector, with considerable work in
 spite of the excellent conditions -- possibly a laser threshold
 problem.
 The DIS observations were mostly more peaceful, but both DIS and
 echelle were showing a lot of image motion in the azimuth direction
 (altitude 20-30 in the SE and S).  Finally I clued in that this
 wasn't windshake but bad tracking, and I tried playing with the
 tuning parameters a little.  I didn't want to change any of the
 values too much without being able to see the effects at video
 speed, but I think I managed to improve but not eliminate the
 tracking troubles.  Azimuth PID-loop tuning should be on the slate
 for the upcoming engineering.
                       ------- FAILURE LOG -------
 PROG   INST   FAILURE MODE     TIME
       (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
 ----------------------------------------------------------------------
 UW02    P          I/H      21:20  21:40   Agile filter woes
               ---------------- FOCUS LOG ---------------
 Time  Instrument  Focus    Az  El  Temp Strc Prim  Sec  Air  filt FWHM
 ----------------------------------------------------------------------
 20:35 Agile  -175(370)    70  72  6.6  8.21  7.29 7.67 7.19  U   0.85
 20:38 NA2gdr 816(36817)   72  60  7.1  8.11  7.34 7.55 7.16  R   0.81
 02:25 DISslit -44(30)     18  57  7.3  7.06  6.54 6.86 6.97  -   1.0
 04:55 Echelle -85(-850)   45  60  6.0  6.14  5.61 5.94 6.28 ND3  1.1
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    -------------------------------------------------------------------
     16:00    57    18      8   266    (W)    538    clear     none
     17:00    49    13      2   264    (W)    487    clear     none
     18:00    50    14     14   267    (W)    581    clear     none
     19:00    48    14     10   268    (W)    496    clear     none
     20:00    44    14      7   256  (WSW)    581    clear     none
     21:00    44    14     13   238  (WSW)    624    clear     none
     22:00    45    12     11   227   (SW)    643    clear     none
     23:00    46    12     10   227   (SW)    544    clear     none
     00:00    46    11     12   223   (SW)    547    clear     none
     01:00    46    10     12   224   (SW)    533    clear     none
     02:00    46    10     13   226   (SW)    479    clear     none
     03:00    45    11     13   234   (SW)    506    clear     none
     04:00    43    11     12   236   (SW)    557    clear     none
     05:00    44    11      6   260    (W)    523    clear     none
     06:00    45    13     11   273    (W)    399    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