Subject: 3.5m Night Log 20191215
From: cgray@apo.nmsu.edu
Date: Mon, 16 Dec 2019 13:41:15 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, December 15, 2019
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
CU01  J.Roberts         J.Roberts
NA02  K.Allers          K.Allers
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU01  ARCTIC         18:18   20:15
NA02  TripleSpec     04:55   06:30
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU01/R      17:07  00:36   1.6  3.9   0    0   1.9   0   0    0
NA02/R      00:36  06:50    0   5.3   0    0   1.9   0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: C.Gray
Well that was a roller coaster of a weather night. It was anticipated to be clear, though windy. Well, one of those things was correct. It was too windy to open (gusting near 40mph) at sunset but things calmed down slightly around 19:00, which is when the clouds rolled in. CU01 was able to get some exposures before everything went opaque. Then the winds kicked back up. We closed at 20:15 and the rest of the night looked hopeless.  For fun, we lost power shortly after midnight but we were only on generator power for about 10min. Then, at 5:00am, everything cleared!! And we had subarcescond seeing!
                    ------- FAILURE LOG -------
              FAILURE MODE     TIME
PROG   INSTR     TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 18:25 arctic   504(  616) 213  70   2.4  3.5  3.6  3.4  2.6   sdss-r  1.88
 05:03 tcamera    385(  222) 173  68  -4.9 -3.4 -2.6 -3.8 -4.7   Ks  0.94
 06:17 tcamera    657(  400) 221  35  -6.5 -5.9 -5.0 -6.1 -6.2   Ks  2.17
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    40    21     24   260    (W)    416    clear     none
     17:00    38    22     27   257  (WSW)    367    clear     none
     18:00    36    24     21   261    (W)    409  ptly cldy   none
     19:00    36    24     17   266    (W)    344 mstly cldy   none
     20:00    36    24     20   262    (W)    302  ptly cldy   none
     21:00    35    22     32   265    (W)    312 mstly cldy   none
     22:00    32    22     21   268    (W)    450   cloudy     none
     23:00    30    22     28   268    (W)    758   cloudy     none
     00:00    29    20     39   273    (W)    356   cloudy     none
     01:00    28    17     22   269    (W)    415   cloudy     none
     02:00    27    17     20   283  (WNW)    452   cloudy     none
     03:00    26    17     13   274    (W)    433   cloudy     none
     04:00    24    14     17   278    (W)    478 mstly cldy   none
     05:00    23    12     14   276    (W)    658 mstly clr    none
     06:00    21    10      8   316   (NW)    438    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.
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