Subject: 3.5m Night Log 20191004
From: mcmillan@apo.nmsu.edu
Date: Sat,  5 Oct 2019 10:36:27 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, October 04, 2019
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW04  Z.Ivezic          B.Sipocz
GS03  S.Lepine          N.Hejazi
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW04  ARCTIC         --:--   --:--
GS03  ECHELLE        --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP      OBS     NOT USED
 I/ROW/DTN  START  FINISH    D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW04/R      18:53  01:10    1.6  4.7   0    0   0.0  0.0   0    0
GS03/R      01:10  06:52    5.7   0    0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
We had fog all night.  Since the primary dewpoint sensor was iced over,
this isn't obvious from the logs or graphs, but the secondary dewpoint
sensor was pretty close to telling the truth.  And in any case, when
there's actual fog it's easy for human senses to put an accurate number
on the humidity.
I had two altitude motion errors during checkout, one upward-moving at
alt 68 and one downward-moving at alt 43.  I expected to find moth guts,
but the drive surface was clean.  Hopefully this is not the start of a
pattern.
                    ------- 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
--------------------------------------------------------------------------
             ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    51    31     16   238  (WSW)        mstly cldy  humid
     17:00    51    30     12   204  (SSW)        mstly cldy  humid
     18:00    50    30      8   185    (S)        mstly cldy  humid
     19:00    51    30      6   189    (S)        mstly cldy  humid
     20:00    51    28     12   187    (S)        mstly cldy  humid
     21:00    51    28     11   211  (SSW)          cloudy     fog
     22:00    51    30     13   205  (SSW)          cloudy     fog
     23:00    52    30     12   189    (S)          cloudy     fog
     00:00    52    30     12   210  (SSW)          cloudy     fog
     01:00    51    29      7   262    (W)          cloudy     fog
     02:00    51    29      8   263    (W)          cloudy     fog
     03:00    52    29     11   246  (WSW)          cloudy     fog
     04:00    51    30     11   273    (W)          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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