Subject: 3.5m Night Log 20220425
From: mcmillan@apo.nmsu.edu
Date: Tue, 26 Apr 2022 12:17:50 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, April 25, 2022
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW02  A.Heinze          A.Heinze
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW02  DIS            20:40   22:10
UW02  DIS            01:30   05:40
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW02/R      19:49  06:13   3.3   0    0    0   5.2  1.9   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
The combination of medium dust and medium humidity and east wind looked unpromising, but it was due to non-weather issues that we stayed closed through evening twilight.  Dust and humidity both kept creeping up until we closed, then stabilized right near the limit.  The only thing that changed was that the target field moved further west away from the wind direction.
So a few hours later I decided to give it a try and see how much advantage we got pointing away from the wind.  It wasn't much advantage, but soon after that the wind moderated and so did dust and humidity, so we stayed open.
Everything worked well tonight.
                    ------- 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
--------------------------------------------------------------------------
 19:49 dcamera    350(  739) 128  70   4.4  7.6  8.2  7.5  6.4   -  2.95
 00:36 dcamera    597(  720) 239  50   1.2  1.8  4.7  2.6  2.7   -  2.79
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    50    19     10   301  (WNW)   4996    clear     none
     17:00    55    24      9   263    (W)   2466    clear     none
     18:00    53    23      5   272    (W)   2938    clear     none
     19:00    46    25      9    87    (E)   1975    clear     none
     20:00    41    26     17    82    (E)   2507    clear     none
     21:00    40    26     23    74  (ENE)   3442    clear     none
     22:00    39    27     26    79    (E)   5185    clear     none
     23:00    38    27     22    76  (ENE)   6111    clear     dust
     00:00    36    26     21    79    (E)   5958    clear     dust
     01:00    35    25     26    72  (ENE)   6006    clear     dust
     02:00    34    25     19    77  (ENE)   5932    clear     none
     03:00    33    24     18    79    (E)   5258    clear     none
     04:00    35    24     10    86    (E)   5531    clear     none
     05:00    42    14     15   110  (ESE)   5579    clear     none
     06:00    40    17     19   116  (ESE)   5935    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.
              ----------  TELESCOPE SOFTWARE  ----------
Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 2.6.0