Subject: 3.5m Night Log 20190206
From: mcmillan@apo.nmsu.edu
Date: Thu,  7 Feb 2019 12:58:09 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, February 06, 2019
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
P.Nedialkov       P.Nedialkov           ARCTIC         --:--   --:--
J.Keller          J.Keller,R.Leiva,     ARCTIC         01:55   03:25
                  S.Haley,R.Strauss
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 ----------------------------------------------------------------
UW06/R     17:49   22:10   2.7  1.7   0    0   0.0  0.0   0    0
CU03/R     22:10   06:45   7.1   0    0    0   1.5  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
At the start of the night we had heavy overcast, high winds and humidity, and a few snowflakes.  Gradually the conditions improved to borderline, at the same time the temperature dropped precipitously.
DIS was not working tonight, so the first program had to change their plans, but the weather didn't improve until second half anyway.  We were able to open for a while at 2 am, with poor seeing and variable clouds and some wind restrictions, and then we had to close when humidity went up again.
The inside dewpoint sensor was reporting nonphysical numbers.  The ARCTIC shutter continued to work down to a dome temperature of -10.2 C, then failed at -10.5 C.
                    ------- 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
--------------------------------------------------------------------------
 02:05 arctic   452(  -52)  50  65  -10.3 -7.0 -5.7 -7.6 -9.4   VR  2.05
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    28    22     36   250  (WSW)          cloudy   lt snow
     17:00    28    24     20   253  (WSW)          cloudy     none
     18:00    26    22     29   254  (WSW)          cloudy     none
     19:00    22    20     26   289  (WNW)          cloudy    humid
     20:00    20    19     26   274    (W)          cloudy    humid
     21:00    19    18     30   275    (W)          cloudy    humid
     22:00    18    16     32   272    (W)          cloudy    humid
     23:00    17    12     38   288  (WNW)          cloudy     none
     00:00    16    11     24   269    (W)          cloudy     none
     01:00    15     8     12   284  (WNW)        mstly cldy   none
     02:00    13     8     22   276    (W)         ptly cldy   none
     03:00    13     8     13   272    (W)         ptly cldy  humid
     04:00    12     9     13   283  (WNW)           clear    humid
     05:00    11     8     21   287  (WNW)           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: 1.2.4
    Current TUI version: 2.6.0