Subject: 3.5m Night Log 20250824
From: dembicky@apo.nmsu.edu
Date: Mon, 25 Aug 2025 12:56:14 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, August 24, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
CU02  Y.Notsu           Y.Notsu
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU02  ARCTIC         20:16   00:30
CU02  ARCTIC         03:00   03:45
CU02  ARCTIC         04:45   06:23
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU02/R      19:46  06:25  3.5  0.5   0    0   6.3  0.3   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: J.Dembicky
Delayed opening by 30 mins due to clouds
ALCOR All Sky camera was not working at start of the night.  I had to power cycle
and plug/unplug the USB cable to get it working.  The ALCOR computer is updating
images but the web page is stuck displaying images from Aug 22.
Sky cleared shortly after sunset but clouds returned 23:00 and we were no longer
able to observe after 00:30.  I stayed open as there were no radar returns but kept
an eye on the sky just in case.  At 01:40 I started seeing somß©ething popping up on
radar just to our east and decided to close as a precaution.  Clouds rolled back in
around 03:45 for about an hour.
                    ------- 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
--------------------------------------------------------------------------
 20:35 arctic   421( 1464) 125  32  15.3 17.4 17.2 17.2 15.6   4170  1.79
 20:37 NA2gdr 35166(35166) 125  32  15.1 17.4 17.1 17.0 15.5   R  1.31
 03:05 arctic   453( 1254) 229  69  12.7 12.8 13.6 12.9 12.5   4170  1.30
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    65    45     13   196  (SSW)    803  ptly cldy   none
     17:00    65    45      5   204  (SSW)    817 mstly cldy   none
     18:00    67    45     13   213  (SSW)    819 mstly cldy   none
     19:00    63    42     14   209  (SSW)    692  ptly cldy   none
     20:00    60    42     12   145   (SE)    736 mstly clr    none
     21:00    59    42     14   161  (SSE)    799    clear     none
     22:00    59    41     16   151  (SSE)    772 mstly clr    none
     23:00    58    42     20   133   (SE)    873 mstly cldy   none
     00:00    57    46     20   136   (SE)   1100   cloudy     none
     01:00    56    47     21   128   (SE)          cloudy     none
     02:00    56    47     17   141   (SE)        mstly cldy   none
     03:00    55    47     16   140   (SE)        mstly clr    none
     04:00    54    47     15   152  (SSE)          cloudy     none
     05:00    57    38     14   183    (S)    698 mstly clr    none
     06:00    56    37     11   185    (S)    675 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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