Subject: 3.5m Night Log 20060519
Date: Sat, 20 May 2006 06:34:57 -0600 (MDT)
From: bketzeba@apo.nmsu.edu (Bill Ketzeback)
                        Apache Point Observatory
                        3.5m Telescope Night Log
                         Friday, May 19, 2006
                                                         ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 S.Majewski      S.Majewski             DIS            22:00 01:00
 D.Spergel       S.Majewski             DIS            01:00 06:30
  INST     SCHED(TWILIGHT)   WEATH     EQUIP     OBS     DAY  NOT USED
 I/ROW/DN    START FINISH   D    B    D    B    D    B   USE   D    B
 ----------------------------------------------------------------------
 DD03/O      20:59 01:00   1.0   0    0    0   3.0   0    0    0    0
 PU03/O      01:00 05:00    0    0    0    0   0.9  3.1   0    0    0
  note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: B.Ketzeback
 Guiding with the dis-slitviewer tonight was very frustrating. The observer
 was attempting to use the 1.2 slit with the occulting bar and observing in
 horizon coordinates. I redefined the boresight location using the 'set
 imcenter' command to place the sweet spot several arcseonds to the left of
 the bar. However, guiding in horizon coordinates looked like it had no effect,
 the star would continue to march off the slit with each exposure. The boresight
 showed in the guider display where I defined it and ctrl-click offsets worked
 fine however when using boresight guiding, the algorithm just could not keep
 up with the field rotation, even though the boresight had been redefined to
 a location still near the center of the field of view.  Frustrated after
 several hours of repeatedly little or no success we tried reverting to
 manual guiding. Later in the night we had some better guiding by approximating
 the parallactic angle, slewing to this rotation angle and tracking in object
 rotation coordinates. Attempting to guide on a field star in horizon
 coordinates had the same poor results. We attempted guiding using the
 observers TUI 1.1 and my TUI 1.2b5 with the same results.
                       ------- 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
 ---------------------------------------------------------------------
 22:38 dis-slit    -50(1096)   136 71  15.2/15.7  10   14   -     1.06
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:01    65    26      0   210  (SSW)   1117  mstly cldy  none
     17:01    65    24      5   268  (W)     1168  mstly cldy  none
     18:01    62    27      0   174  (S)     1123  mstly cldy lt. rain
     19:01    61    28      5   228  (SW)    1230  mstly cldy  none
     20:01    61    26      8   269  (W)     1407  mstly cldy  none
     21:01    60    27      9   312  (NW)    1693  prtly cldy  none
     22:01    60    27     10   318  (NW)    1916  mstly clr   none
     23:01    59    29      8     8  (N)     1174   clear      none
     00:01    58    30      9    31  (NNE)   1159   clear      none
     01:01    59    28     13   347  (NNW)   1020   clear      none
     02:01    58    28     16   357  (N)     1298   clear      none
     03:01    60    26     10     9  (N)     1082   clear      none
     04:01    60    26      1     2  (N)      935   clear      none
     05:01    59    26      9     6  (N)      983   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: 2.8.4
      Current TUI version: TUI 1.1