Subject: 3.5m Night Log 20200225
From: trudyk@apo.nmsu.edu
Date: Wed, 26 Feb 2020 13:13:45 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, February 25, 2020
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
JH02  S.Cheng           S.Cheng
GS03  S.Lepine          N.Hejazi
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
JH02  DIS            20:28   20:45
GS03  ECHELLE        02:20   06:00
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
JH02/R      18:05  00:10    4.2  1.6  0    0   0.0  0.3   0    0
GS03/R      00:10  06:27    2.2  0    0    0   4.1  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: T.Rudyk
Unexpected clouds and snow in the afternoon. Got very cold as well. Snow and clouds blew out before sunset leaving clear cold skies...and then came back. The condtions were changing from minute to minute. We stayed closed as a precaution, and when the snow started onsite again, was proven correct in our caution. We opened at 20:28. We were suprised by snow (which was not on radar) at 20:45. We immediately closed. Humidity then spiked as well. Then winds also went above safe levels. More snow after 23:00-00:00. We were finally able to open at 02:20 and stayed open thereafter.
                    ------- 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
--------------------------------------------------------------------------
 20:32 dcamera    272( -351)  15  54  -10.7 -8.4 -8.0 -8.2 -10.1   -  2.19
 02:24 ecamera    535(-1144)  -9  82  -12.5 -11.1 -9.1 -11.4 -11.8   clear  1.12
         ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    18    -2     13    31  (NNE)    259  ptly cldy lt snow
     17:00    18     0     13    12  (NNE)    222    clear     none
     18:00    17     2     17    57  (ENE)    272  ptly cldy lt snow
     19:00    16    -1     15    32  (NNE)    212 mstly clr    none
     20:00    15    -5     17    66  (ENE)    168 mstly clr    none
     21:00    12     8     21    70  (ENE)        mstly clr   humid
     22:00    11     6     31    73  (ENE)        mstly clr   humid
     23:00    10     6     21    47   (NE)        mstly clr   humid
     00:00     9     6     16    66  (ENE)        mstly clr  lt snow
     01:00     9     4     16    71  (ENE)        mstly clr  lt snow
     02:00     9     3     12    48   (NE)        mstly clr    none
     03:00    13    -1      8   357    (N)    266 mstly clr    none
     04:00    14    -2      2   306   (NW)    220 mstly clr    none
     05:00    12    -2      6   346  (NNW)    252 mstly clr    none
     06:00    12    -1      7   336  (NNW)    262 mstly clr    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.
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