From:
Subject: 3.5m Night Log 20100418
Date: Mon, 19 Apr 2010 12:09:56 +0000 (UTC)
                       Apache Point Observatory
                       3.5m Telescope Night Log
                        Sunday, April 18, 2010
                                                        ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
 -------------------------------------------------------------------
 T.Murphy        R.McMillan             APOLLO         --:--  --:--
 P.Szkody        P.Szkody               DIS            --:--  --:--
 J.Gauthier      J.Helsby               DIS            02:30  05:25
   INST     SCHED(TWILIGHT) WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 -----------------------------------------------------------------
 UW16/O     19:44  20:44    0   1.0   0    0    0    0    0    0
 UW09/R     20:44  01:10   0.9  3.5   0    0    0    0    0    0
 UC02/R     01:10  06:20   1.4   0    0    0   3.8   0    0    0
 note: scheduled times listed include instrument change time
               ------------- ACTIVITY LOG --------------
 Observing Specialist: R.McMillan
 A thunderstorm at sunset, followed by clouds and high humidity and
 threat of more possible rain, kept us closed for most of the night.
 During second half the clouds thinned out and humidity dropped, so I
 felt it was safe to open.  Occasional patches of cloudiness and
 poor seeing made the data-taking a challenge, but overall the time
 was useful.
 I heard one case of the medium-pitch ringing noise at 08:35 when I
 activated the motors after opening the dome; the effect was not
 apparent on the motor telemetry or PMSS dataq, and the noise stopped
 on the first slew.  I did not encounter any examples of the much
 nastier low-frequency noise, but we weren't observing in the
 northwest where the problem was previously seen.
                     ------- FAILURE LOG -------
 PROG   INST   FAILURE MODE     TIME
      (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
 ----------------------------------------------------------------------
              ---------------- FOCUS LOG ---------------
 Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
 --------------------------------------------------------------------------
 02:56 dis-slit   -75( -145)  -6  55   5.2  6.5  6.9  5.5  5.7   -   1.40
               ------------- WEATHER LOG ----------------
                                  Wind                      Precip.or
    Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
   -------------------------------------------------------------------
     16:00    53    31      2   250  (WSW)    905   cloudy     none
     17:00    47    31      9   266    (W)    829   cloudy     none
     18:00    46    31      5   289  (WNW)   1045   cloudy     none
     19:00    45    31      8   214   (SW)    921   cloudy     none
     20:00    38    31      4   263    (W)   1402   cloudy     rain
     21:00    40    31      7   119  (ESE)   1501   cloudy   lt rain
     22:00    44    30      2   276    (W)   2496   cloudy   lt rain
     23:00    42    31      9   275    (W)   2184 mstly cldy   none
     00:00    44    31      8    28  (NNE)   2678 mstly cldy   none
     01:00    45    30      8   345  (NNW)   2370 mstly cldy   none
     02:00    44    29      4   283  (WNW)   2406  ptly cldy   none
     03:00    41    31      3   216   (SW)   1486  ptly cldy   none
     04:00    42    31      8   330  (NNW)   2257  ptly cldy   none
     05:00    41    31      4   279    (W)   2056  ptly 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: 2.11.1
     Current TUI version: TUI 1.7.1