Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, May 13, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
CU04  A.Kowalski        A.Kowalski            
OU02  G.Jewett          M.Barrientos          

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU04  KOSMOS         --:--   --:--   
OU02  ARCTIC         03:10   05:10

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU04/R      20:03  01:10  5.1    0    0    0   0.0  0.0   0    0
OU02/R      01:10  05:56  2.0    0    0    0   1.0  1.7   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot,R.McMillan

Arctic biases show saturated values in the LL quad during afternoon checkout like yesterday's problem. Problem disappeared after a few exposures. Added a comment to the existing PR. Quad mode used during observations, and appeared to be functioning properly throughout.

Echelle VSET was set back to 0. CCD temperature remains stable at -90C. 

Arcsat user said Aquiredimages script was completing but not actually doing anything. After VNCing into arcsat-user, there were many unneccessary windows open (preferences, log, properties). Upon closing these, script immediately started running again.
Arcsat failed to point at the flat screen. Went to dome and re-zenithed the telescope. After this, telescope was able to point at flat screen successfully.

Nearby rain kept us closed through to 03:10. Rain appeared again around 12 deg twilight and forced closure. 

                    ------- 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
--------------------------------------------------------------------------
 03:20 arctic   276( 1189) 188  56  14.5 15.1 17.7 14.9 14.5   BG40  1.14


               ------------- WEATHER LOG ----------------

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    69    21      8   202  (SSW)   1225  ptly cldy   none 
     17:00    72    21     22   181    (S)   1129  ptly cldy   none 
     18:00    70    23     14   202  (SSW)   1075  ptly cldy   none 
     19:00    65    18     14   185    (S)    985  ptly cldy   none 
     20:00    64    16      9   181    (S)   1148 mstly cldy   none 
     21:00    64    15     14   178    (S)   1083   cloudy     none 
     22:00    63    18      9   179    (S)   1451   cloudy     rain 
     23:00    61    27     17   259    (W)   2665   cloudy     rain 
     00:00    60    27     17   204  (SSW)   2064   cloudy     rain 
     01:00    58    25      9   179    (S)   1669  ptly cldy   rain 
     02:00    58    25      7   117  (ESE)   1756 mstly clr    none 
     03:00    59    26      1   222   (SW)   1923 mstly clr    none 
     04:00    58    27      1   330  (NNW)   1809  ptly cldy   none 
     05:00    59    27      9   305   (NW)   2029 mstly cldy   rain 

     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: 3.1.8