Subject: 3.5m Night Log 20191111
From: trudyk@apo.nmsu.edu
Date: Tue, 12 Nov 2019 11:29:08 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, November 11, 2019
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
EN01  B.Ketzeback       R.Mcmillan, T.Rudyk
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
EN01  ARCTIC         03:20   04:00
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
EN01/R      17:13  00:10    0   12.5  0    0   0.0  0.7   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: T.Rudyk
Evening started partly cloudy, but the humidity began to spike immediately after sunset, we had some misting and then fog. We did indoor tasks. Fog and humidity blew out around 03:00...or so we thought. We opened at 03:20 and tried to do throughputs but the fog resturned very suddenly around 04:00. We closed, and decided to stay closed due to the instability, ignoring the siren calls of sporadically dry air.
                    ------- 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
--------------------------------------------------------------------------
 03:33 arctic   497(  475)  15  54  -0.4  0.6  1.7  0.6  0.8   SDSS_r  2.20
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    40    33      1   217   (SW)    723   cloudy   lt rain
     17:00    39    32      1   238  (WSW)    562   cloudy    humid
     18:00    29    24     10    81    (E)          cloudy    humid
     19:00    26    24      6    90    (E)          cloudy   lt rain
     20:00    24    21     14    71  (ENE)          cloudy    humid
     21:00    23    22     13    64  (ENE)          cloudy     fog
     22:00    29    28      8    18  (NNE)          cloudy     fog
     23:00    30    31      2   257  (WSW)          cloudy     fog
     00:00    29    30      1   235   (SW)          cloudy     fog
     01:00    32    32     12    46   (NE)          cloudy     fog
     02:00    32    27      7    70  (ENE)          cloudy     none
     03:00    40    21      2    80    (E)    363   cloudy     none
     04:00    29    27      5    88    (E)   1821   cloudy     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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