Subject: 3.5m Night Log 20210728
From: decolib@apo.nmsu.edu
Date: Thu, 29 Jul 2021 12:22:17 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, July 28, 2021
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
EN02  B.Ketzeback       D.DeColibus, R.McMillan
AP01  S.Merkowitz       R.McMillan
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
EN02  ARCTIC         21:43   23:14
AP01  APOLLO         05:14   06:07
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
EN02/W      20:13  05:07   1.6  5.8   0    0   1.5  0.0   0    0
AP01/R      05:07  06:07    0   0.1   0    0   0.0  0.9   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: D.DeColibus
Engineering! See the seperate engineering email for details.
We opened around 21:45 as the clouds cleared, and closed about 1.5 hours later as the dust and humidity spiked. The humidity went back down, but the clouds returned and the dust stayed high until about 4:30 AM.
We did get the instrument block for ARCTIC done before we closed, though, and the dust dropped enough that we could open around 05:15 for APOLLO and adjust the pointing corrections at BC1.
                    ------- 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
--------------------------------------------------------------------------
 21:53 arctic   690( 1364)  90  68  14.6 15.5 16.0 15.3 14.9   SDSS_r  1.31
 05:56 APOLLO     725( 1936) -12  58  12.7 12.9 14.0 12.6 12.9   530  1.50
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    64    45      3   193  (SSW)   1163 mstly cldy   none
     17:00    65    42      2   168  (SSE)   1190 mstly cldy   none
     18:00    66    50      5   210  (SSW)   2681 mstly cldy   none
     19:00    62    47     11    62  (ENE)   1243 mstly cldy   none
     20:00    60    46     16    76  (ENE)   1135  ptly cldy   none
     21:00    59    44     15    86    (E)   1297  ptly cldy   none
     22:00    58    48     15    85    (E)   2197 mstly clr    none
     23:00    57    51     17    82    (E)   4478 mstly clr    dust
     00:00    57    50     14    79    (E)   5362  ptly cldy   dust
     01:00    58    46     16    72  (ENE)   5126 mstly cldy   dust
     02:00    58    44     13    82    (E)   4684 mstly cldy   dust
     03:00    56    45     15    57  (ENE)   5736 mstly cldy   dust
     04:00    54    45     15    77  (ENE)   4681 mstly cldy   dust
     05:00    54    46     15    92    (E)   3130  ptly cldy   none
     06:00    55    45      3    80    (E)   2423    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.
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