Subject: 3.5m Night Log 20231224
From: mcmillan@apo.nmsu.edu
Date: Mon, 25 Dec 2023 11:16:22 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, December 24, 2023
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
EN01  B.Ketzeback       R.McMillan
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
EN01  ARCTIC         20:00   23:45
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
EN01/W      17:12  06:55   0.9  9.2   0    0   0.0  3.7   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
Clear skies for most of the night, but there was some snow on the dome so thee were additional opening restrictions. I delayed opening until the mirrors were erll below freezing and the wind was below 15 mph, although it did play with that limit for a while.  When the humidity rose I closed up and did some in-dome work.  The forecast said humidity should drop after 3 am, but when there was blowing fog at 4 am I decided it was time to give up.
                    ------- 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
--------------------------------------------------------------------------
 20:18 arctic   277(  613)   2  63  -2.7 -1.4 -2.0 -2.1 -2.5   SDSS_r  0.73
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    30    17      4   327  (NNW)    138    clear     none
     17:00    27    20      7   338  (NNW)    204    clear     none
     18:00    26    20      8     2    (N)    170    clear     none
     19:00    26    20      6   357    (N)           clear     none
     20:00    28    18     11   354    (N)    171    clear     none
     21:00    28    18     13     9    (N)    190    clear     none
     22:00    28    18      9   328  (NNW)    170    clear     none
     23:00    26    21      5   358    (N)           clear    humid
     00:00    24    23      3    36   (NE)           clear    humid
     01:00    24    22      7   357    (N)           clear    humid
     02:00    23    23      3   290  (WNW)           clear    humid
     03:00    24    23      9   336  (NNW)           clear    humid
     04:00    23    23      8   337  (NNW)        mstly cldy   fog
     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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