Date: Fri, 26 Sep 2008 06:16:09 -0600
From: "Jeff Coughlin"
Subject: 3.5m Night Log 20080925
                     Apache Point Observatory
                     3.5m Telescope Night Log
                     Thursday, September 25, 2008
                                                        ACTUAL
 ASTRONOMER     OBSERVER(S)            INSTRUMENT   START  FINISH
 -------------------------------------------------------------------
 B.Williams   B.Williams                DIS         19:48  01:05
 H.Weaver     H.Weaver,C.Lisse          SPICAM      01:05  05:23
  INST     SCHED(TWILIGHT) WEATH     EQUIP      OBS     DAY  NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 UW07/R     19:48  01:05    0    0    0    0   5.3   0   0    0    0
 JH04/R     01:05  06:01    0   0.6   0    0   3.0  1.3  0    0    0
 note: scheduled times listed include instrument change time
               ------------- ACTIVITY LOG --------------
 Observing Specialist: J. Coughlin
 Az Velocity Scale was 577.0, measured 577.4, 581.55; 579.5. Changed to 579.0.
 We had thick clouds in the late afternoon, but they completely cleared out
 by sunset. Humidity was high, and continued to slowly rise until around
 22:30 where it flirted with closure limits.  Luckily it leveled off and then
 fell and we were able to stay open. Just after 05:00 the humidity began to
 sharply rise and I was forced to close at 05:23 for the remaining 40
 minutes of the night.
 Seeing was poor first half (2"), but settled to around 1" in second half.
                      ------- 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
 -----------------------------------------------------------------
 19:32 dis-slit    44(  238)  97  51   9.0 11.8 10.4 10.6  9.2     1.66
 21:50 dis-slit    25(   61)  46  41   8.1  8.3  8.5  7.8  8.0     1.90
 01:26 SPICAM     -73(  142)   5  58   7.8  7.3  7.8  6.5  7.6     0.90
               ------------- WEATHER LOG ----------------
                                  Wind                      Precip.or
    Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
   -------------------------------------------------------------------
     16:00    54    42      6   281    (W)    153   cloudy     none
     17:00    53    42      0   327  (NNW)    998 mstly cldy   none
     18:00    52    44      8    92    (E)   1062  ptly cldy   none
     19:00    50    43      9    85    (E)   1717 mstly clr    none
     20:00    48    41     17   121  (ESE)   1541    clear     none
     21:00    47    42     19   112  (ESE)   1604    clear     none
     22:00    46    42     16   124   (SE)   1483    clear     none
     23:00    46    40     13   130   (SE)   1314    clear     none
     00:00    46    39     18   134   (SE)   1237    clear     none
     01:00    46    38      8   110  (ESE)   1299    clear     none
     02:00    48    38      1   125   (SE)   1335    clear     none
     03:00    49    34      1   199  (SSW)   1096    clear     none
     04:00    48    37      2   198  (SSW)   1238    clear     none
     05:00    45    39      6   124   (SE)   1308    clear    humid
     06:00    43    41      5   108  (ESE)   1543    clear    humid
    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: 2.9.1
     Current TUI version: TUI 1.5