Subject: 3.5m Night Log 20250919
From: tsutherland@apo.nmsu.edu
Date: Sat, 20 Sep 2025 12:11:25 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, September 19, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
CU02  Y.Notsu           Y.Notsu
JH02  C.Ingebretsen     C.Ingebretsen,G.Jewett
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU02  ARCTIC         --:--   --:--
JH02  ARCTIC         00:48   04:00
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU02/R      19:12  01:10   6.0   0    0    0    0    0    0    0
JH02/R      01:10  06:42   2.0  1.1   0    0   2.8   0    0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: T.Sutherland
Radar returns and clouds kept us closed for a while. I went to open at midnight, but as I was opening the dome I saw a big flash of lightning, so I made the executive decision not to open at that time.
Did a USB restart of the all sky cam at the beginning of the night.
Finally opened for real at 12:47. By then CU02 had given up, so that time went to JH02. 0.3 Hours was taken from CU02 and given to JH02 in section 3 of this report.
Humidity got worse around 4am and I had to close. JH02 gave up at 5:45am since clouds were persistent.
No telescope or instrument problems 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
--------------------------------------------------------------------------
 01:03 arctic   422( 1240)  18  52  11.7 13.0 13.5 12.6 11.9   BG40  1.09
 02:02 arctic   380( 1160)  -7  53  12.3 12.2 12.7 11.8 11.9   BG40  0.98
          ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    62    51     14   226   (SW)    488  ptly cldy   none
     17:00    61    51      8   232   (SW)    434 mstly cldy   none
     18:00    56    50      9   280    (W)        mstly cldy  humid
     19:00    54    52      1    48   (NE)         ptly cldy lt rain
     20:00    55    48      4   344  (NNW)         ptly cldy  humid
     21:00    55    49      7   314   (NW)        mstly cldy  humid
     22:00    55    49      1   233   (SW)          cloudy    humid
     23:00    54    49      6   352    (N)        mstly clr   humid
     00:00    53    47      4   340  (NNW)        mstly clr    none
     01:00    54    44      4   270    (W)    190    clear     none
     02:00    54    45      8   258  (WSW)           clear    humid
     03:00    53    47      6   261    (W)           clear    humid
     04:00    51    47      6   224   (SW)         ptly cldy  humid
     05:00    51    47      6   263    (W)          cloudy    humid
     06:00    51    47      8   266    (W)          cloudy    humid
     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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