Subject: 3.5m Night Log 20240804
From: mcmillan@apo.nmsu.edu
Date: Mon,  5 Aug 2024 12:29:12 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, August 04, 2024
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
WY02  C.Kobulnicky      N.Patten
CU01  Y.Notsu           Y.Notsu
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
WY02  KOSMOS         22:00   00:54
CU01  ARCTIC         01:19   06:05
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
WY02/R      20:07  01:10   1.4  0.5   0    0   3.2  0.0   0    0
CU01/R      01:10  06:12    0    0    0    0   5.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
The night started with a nearby thunderstorm followed by dust just above the limit.  When we checked the handheld dust counter, it read just over half the counts of the inside counter, well below the limit.  So we watched a little longer to be sure conditions were stable and then tried opening with fans in a defensive configuration.  The inside dust agreed with the handheld counter results, and never got above 3000.  Seeing was bad initially but improved as the wind and weather continued to settle.
While closed, we checked the scattered light on DIS and found that it has grown worse since June.  The isntrument is usable with reduced sensitivity, particularly in the blue.
                    ------- 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
--------------------------------------------------------------------------
 22:20 kosmos   300( 1451)   1  40  15.7 16.7 17.9 16.4 15.8   -  2.60
 01:28 arctic   350( 1415) 225  68  14.3 14.2 14.9 14.1 14.2   4170  1.39
 01:48 NA2gdr -3640(34359) 229  65  14.5 14.1 14.8 14.0 14.1   clear  1.25
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    68    48      1   132   (SE)   4379  ptly cldy   none
     17:00    68    49      1   227   (SW)   4477 mstly cldy   none
     18:00    66    50     11    79    (E)   4299   cloudy     none
     19:00    65    48      1   161  (SSE)   3092 mstly cldy   none
     20:00    63    50     14   113  (ESE)   4484  ptly cldy   none
     21:00    61    51     13    85    (E)   4196 mstly clr    none
     22:00    60    51     15    88    (E)   4158 mstly clr    none
     23:00    59    50     13    76  (ENE)   4257 mstly clr    none
     00:00    59    49     12    89    (E)   4221    clear     none
     01:00    58    50     12    86    (E)   4134    clear     none
     02:00    58    49     12    76  (ENE)   4365    clear     none
     03:00    58    49     14    63  (ENE)   4036    clear     none
     04:00    58    48     16    54   (NE)   3979    clear     none
     05:00    59    48      9   358    (N)   4086    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: 3.1.5