From: Russet McMillan
Subject: 3.5m Night Log 20060402
Date: Mon,  3 Apr 2006 06:22:08 -0600 (MDT)
                        Apache Point Observatory
                        3.5m Telescope Night Log
                         Sunday, April 2, 2006
                                                         ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 T.Murphy       J.Battat,A.Orin         APOLLO         19:35  20:59
 D.York         D.York                  DIS            21:03  00:47
 B.Keeney       Q.Hart                  SPIcam         01:45  03:45
 G.Stringfellow R.McMillan              Echelle        05:50  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
 ----------------------------------------------------------------------
 UW08/O      20:18  21:03   0    0    0    0    0   0.7   0    0    0
 UC05/R      21:03  01:00   0    0    0    0   0.3  3.7   0    0    0
 CU05/R      01:00  05:55  2.9   0    0    0   2.0   0    0    0    0
 CU08/W      05:55  06:40   0    0    0    0    0    0   0.7   0    0
  note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: R.McMillan
 Thin cirrus and very good seeing during first half, with thicker
 high clouds second half.  After we focused SPIcam, we were unable to
 do science through the clouds for most of second half.
 During the good seeing, I thought I saw behavior on the DIS
 slitviewer similar to that reported a couple of weeks ago for
 SPIcam: image elongation which was not aligned with either altitude
 or azimuth, and which changed orientation on the instrument slowly
 or not at all as the sky rotated.  It was hard to be sure because of
 the aberrated nature of the slitviewer images, but the elongation
 may have been connected with some misbehavior of the tertiary
 mirror.  I submitted a PR on this hypothesis, and we'll be looking
 for ways to improve the tertiary behavior and to test it as a
 possible cause of the image elongation.  Unfortunately, the
 intermittent clouds second half made it impossible to check for this
 phenomenon with SPIcam tonight.
                       ------- 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
 ---------------------------------------------------------------------
 21:21 DISslit     25(855)     352 63  8.0/7.8    255  5    -     0.91
 01:13 SPIcam      100(998)    18  71  8.6/6.3    255  5    r     0.93
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:01    51     6     10   282  (WNW)   1459  mstly clr   none
     17:01    49     4      8   325  (NW)    1490  mstly clr   none
     18:01    49     4     10   314  (NW)    1538  mstly clr   none
     19:01    47     3      5   273  (W)     1634  mstly clr   none
     20:01    47     5     12   307  (NW)    1764  mstly clr   none
     21:01    47     6      7   268  (W)     1749   cirrus     none
     22:01    47     6      8   226  (SW)    1628   cirrus     none
     23:01    46     4      6   181  (S)     1744   cirrus     none
     00:01    46     4      2   182  (S)     1781  ptly cldy   none
     01:01    47     5      5   197  (SSW)   1584  ptly cldy   none
     02:01    48     5      7   227  (SW)    1423  ptly cldy   none
     03:01    49     5      0   181  (S)     1228  ptly cldy   none
     04:01    49     5      1   158  (SSE)   1033  mstly cldy  none
     05:01    49     6      5   181  (S)      994  mstly cldy  none
     06:01    47     3      6   174  (S)     1232  mstly cldy  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: 2.8.2
      Current TUI version: TUI 1.1