From:
Subject: 3.5m Night Log 20110928
Date: Thu, 29 Sep 2011 12:18:01 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, September 28, 2011
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
W.Bhatti          W.Bhatti              DIS            20:45   01:00
P.Szkody          R.McMillan            DIS            01:02   02:05
B.Williams        B.Williams            DIS            02:08   06:10
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 ----------------------------------------------------------------
JH01/R     19:01   01:10   1.1  0.6   0    0   4.4   0    0    0
UW12/R     01:10   02:10    0    0    0    0   1.0  0.0   0    0
UW04/R     02:10   06:47    0    0   0.1   0   4.5  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
Radar returns at sunset delayed opening, but once we got on sky the
conditions were quite nice.
The instrument worked well, but the enclosure motors failed at 11:33 UT,
a few minutes into an image.  I'm not sure of the reason for the failure;
there had been a power flicker at 11:14 UT with no effect, but I didn't
notice any problems immediately before the enclosure stopped tracking.
Telescope and dome were not visibly out of alignment, but we were in a
part of the sky where azimuth tracking was extremely slow, so possibly
the enclosure really did stop at 11:14 and it simply didn't trigger the
telescope to stop tracking until later.  Once the problem was noticed, it
only took a couple of minutes to fix.
                    ------- FAILURE LOG -------
PROG   INST   FAILURE MODE     TIME
    (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
UW12    D         T/H      05:30  05:37  Encl stopped tracking
            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 20:49 dis-slit   195(  236)  86  69  13.9 14.6 15.0 14.6 14.1   -  1.05
 02:13 dis-slit   300(  279) 135  48  13.5 13.0 13.5 12.7 13.0   -  1.10
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    64    34      5   256  (WSW)    955 mstly cldy   rain
     17:00    54    36      8    57  (ENE)    594 mstly cldy   none
     18:00    59    33      6   103  (ESE)    750  ptly cldy   none
     19:00    58    32      6   105  (ESE)    748  ptly cldy   none
     20:00    58    33      3   111  (ESE)    751  ptly cldy   none
     21:00    57    32      5    96    (E)    636  ptly cldy   none
     22:00    58    31     11   135   (SE)    786 mstly clr    none
     23:00    56    32      7   135   (SE)    952    clear     none
     00:00    57    32      2   134   (SE)    989    clear     none
     01:00    56    32      1   175    (S)    965    clear     none
     02:00    57    32      2   188    (S)    837    clear     none
     03:00    57    31      1   135   (SE)    864    clear     none
     04:00    57    31      7    61  (ENE)    749    clear     none
     05:00    57    30      7    86    (E)    704    clear     none
     06:00    57    30      8    85    (E)    656    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: 2.15.0
    Current TUI version: 1.9.2