Subject: 3.5m Night Log 20181112
From: dembicky@apo.nmsu.edu
Date: Tue, 13 Nov 2018 12:24:49 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, November 12, 2018
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
T.Murphy          R.McMillan            APOLLO         --:--   --:--
C.Kobulnicky      C.Kobulnicky          TSPEC          20:00   23:55
J.Keller       J.Keller,S.Haley,R.Leiva DIS            01:10   01:40
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 ----------------------------------------------------------------
AP01/R     17:12   18:12    0    0    0    0   0.0  1.0   0    0
WY01/R     18:12   00:10    0    0    0    0   2.7  3.2   0    0
CU03/R     00:10   06:23    0    0   5.7   0   0.5  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: J.Dembicky
Brrrr.....It's C.C.C.oooolllllldddd!!!!  Our first major winter cold front tonight.
I noticed a dropped quad on ARCTIC around 21:00 while doing some shutter tests.  It was fine at checkout.
At 00:00 we discovered that the arctic shutter was stuck.  We reset it and Russet changed some parameters but in the end we could not get it to reliably work at -10.6C tonight.  The observers choose to use DIS in imaging mode as an alternative , which I then needed to mount and set up for them.  We lost about 1 hrs trying to get the shutter to work in the cold weather, but to no avail.
We also notice we were getting an oval image instead of a round image for the new VR filter.  When I took the instrument off the filter was positioned properly so I am not sure of the odd image shape we were seeing.
On a positive note, we had no problems with the secondary tonight, so the fix that was implemented for the cold weather tonight seemed to do the trick for the cold weather.
                    ------- FAILURE LOG -------
PROG   INST   FAILURE MODE     TIME
    (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
CU03    R         I/H     00:10  06:23    Too cold (-10.6C) for arctic shutter
                                          to work.
            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 20:10 TSPEC     980                                               Ks   1.93
 01:15 red_dis   755(  -98) -59  40  -10.8 -11.1 -10.4 -11.0 -10.8 Gunn-r 1.95
 01:23 NA2gdr  2720(24720)  56  72  -10.7 -11.2 -10.4 -11.0 -10.8   R  1.95
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    11     5     23    70  (ENE)        mstly cldy  humid
     17:00     9     5     22    66  (ENE)         ptly cldy  humid
     18:00     7     4     25    54   (NE)         ptly cldy   none
     19:00     7     3     21    74  (ENE)        mstly clr    none
     20:00    10     1     17    38   (NE)           clear     none
     21:00    12    -3     15    32  (NNE)     36    clear     none
     22:00    13    -4     15    29  (NNE)     38    clear     none
     23:00    12    -5     10    25  (NNE)     47    clear     none
     00:00    13    -3     14    22  (NNE)     42    clear     none
     01:00    14    -5     16    42   (NE)     52    clear     none
     02:00    12    -3     13    55   (NE)     57    clear     none
     03:00    12    -5      7    61  (ENE)     50    clear     none
     04:00    13    -4     20    43   (NE)     48    clear     none
     05:00    13    -3     17    35   (NE)     58    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.
                          TELESCOPE STATUS
    Telescope drives operational. Current TCC version: 1.2.4
    Current TUI version: 2.6.0