Subject: 3.5m Night Log 20180921
From: mcmillan@apo.nmsu.edu
Date: Sat, 22 Sep 2018 12:16:35 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, September 21, 2018
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
K.Schlaufman      K.Schlaufman          ECHELLE        --:--   --:--
M.Skrutskie       A.Verbiscer           TSpec          03:30   05:40
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 ----------------------------------------------------------------
JH01/R     19:10   01:10    0   6.0   0    0   0.0  0.0   0    0
UV01/R     01:10   06:43   1.0  2.4   0    0   1.2  1.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
The beginning of the night looked a lot like the beginning of last night, with  localized clouds and humidity and strong wind, but clear sky just a short distance away.  Tonight, however, the humidity didn't drop.  A fog bank sat just a few hundred yards east of the observatory, and the wind blowing from that direction brought little sprinkles down on the cloudcam when we tried to open it briefly.  So we waited, and waited some more, until finally the wind eased off and the fog bank withdrew and the humidity went down and stayed down, so we were able to open! For all of an hour, and then the humidity came back up again.  I pushed a little at that point, but when fog started streaming overhead it was time to close.
The sensor recorded in the weather log below is the one that's still frozen over, so it doesn't represent the craziness of the actual moisture in the air.
                    ------- 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
--------------------------------------------------------------------------
 02:38 tcamera    700( 1047)  51  64   8.3  8.8 10.8  8.4  8.9   Ks  1.79
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    52    31     21    70  (ENE)        mstly cldy  humid
     17:00    51    31     20    66  (ENE)        mstly cldy  humid
     18:00    50    31     26    72  (ENE)        mstly cldy  humid
     19:00    49    31     28    75  (ENE)         ptly cldy  humid
     20:00    48    31     23    64  (ENE)        mstly clr   humid
     21:00    47    31     30    78  (ENE)        mstly clr   humid
     22:00    47    31     33    73  (ENE)        mstly clr   humid
     23:00    47    31     27    72  (ENE)        mstly clr   humid
     00:00    46    31     22    66  (ENE)        mstly clr   humid
     01:00    46    31     22    76  (ENE)        mstly clr   humid
     02:00    45    36     24    72  (ENE)        mstly clr   humid
     03:00    44    32     16    87    (E)           clear     none
     04:00    44    32     17   123  (ESE)    293    clear     none
     05:00    42    32     16   103  (ESE)        mstly clr   humid
     06:00    41    32      2    93    (E)        mstly clr   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