Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, February 11, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
BY01  D.Stephens        D.Stephens+class      
JH01  C.Ingebretsen     C.Ingebretsen,M.Macgregor

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
BY01  ARTIC          17:54   12:10   
JH01  ECHELLE        12:15   02:40

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
BY01/R      17:54  00:10    0    0    0    0   6.3  0.0   0    0
JH01/R      00:10  06:41  0.8  3.2    0    0   2.5  0.0   0    0

note: scheduled times listed include instrument change time

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

Clear skies to start the night. Humidity slowly increased throughout the night, eventually forcing a dome closure at 02:40. Humidity stayed high, and clouds increased through to the end of the night so no chance to reopen.

BYU class was trained on ARCTIC, managed to get a full half night of observations in.

ARCSAT had a library support error, fixed by restarting the software. Dataq had to be restarted twice.

                    ------- 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
--------------------------------------------------------------------------
 18:22 arctic     434(  994) 264  46   5.8  7.4  7.2  7.8  5.7  SDSS-r 1.06
 18:27 NA2gdr   36830(36830) 263  45   5.8  7.3  7.2  7.7  5.8  Clear  1.32
 00:21 ecamera    491( -179)  71  44   5.3  4.6  5.3  4.8  4.9  ND3    0.84

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    48    32     13   260    (W)    591 mstly clr    none 
     17:00    44    34     11   196  (SSW)    610 mstly clr    none 
     18:00    42    34      7   205  (SSW)        mstly clr    none 
     19:00    41    33     12   225   (SW)        mstly clr    none 
     20:00    42    34     12   215   (SW)         ptly cldy   none 
     21:00    42    34     14   223   (SW)        mstly clr    none 
     22:00    42    34     12   219   (SW)        mstly clr    none 
     23:00    42    35     12   223   (SW)        mstly clr    none 
     00:00    42    35     10   258  (WSW)        mstly clr    none 
     01:00    41    35      9   223   (SW)        mstly clr    none 
     02:00    41    35      5   199  (SSW)        mstly clr    none 
     03:00    39    36     10   198  (SSW)        mstly clr    none 
     04:00    40    32     11   225   (SW)        mstly cldy   none 
     05:00    39    32     13   209  (SSW)        mstly cldy   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: 3.1.8