Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, February 04, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
OU03  K.Leighly         G.Garcia              
JH04  K.Schlaufman      K.Schlaufman          

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
OU03  NICFPS         17:47   11:55   
JH04  ECHELLE        12:05   06:17

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
OU03/R      17:47  00:10    0    0    0    0   3.0  3.4   0    0
JH04/R      00:10  06:47    0    0    0    0   0.0  6.6   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot, A.Townsend

Clear night with marginally high humidity and poor seeing in A half. Continuing clear night with better seeing and humidity in B half.

Restarted Dataq to get it online again at the beginning of the night.

OU03 finished a little early and donated their remaining time to JH04.

Difference between Sec A 'des enc' and 'cmd' differ by approx 1000000 counts, 'des enc' and 'enc' are still very close and we're not recieving any collimation errors.

                    ------- 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
--------------------------------------------------------------------------
 18:03 NICFPS     572( 1158) 148  28  -1.2  1.2  1.6  2.8 -0.8   MK-J  1.97
 18:34 NA2gdr   51638(51638) 138  37  -1.4  0.1  0.4 -0.4 -1.6   Clear 1.97
 22:08 NICFPS     488(  904) 142  63  -2.1 -1.8 -1.9 -3.1 -2.3   MK-J  3.08
 00:05 ecamera    418( -579) 253  68  -2.0 -2.0 -2.2 -3.1 -2.6   Clear  0.87
 03:31 ecamera    508( -423) 184  45   2.9 -0.8 -0.2 -1.3  1.4   Clear  1.39


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    35    22      6   271    (W)   1084    clear     none 
     17:00    34    22      8   306   (NW)   1063    clear     none 
     18:00    30    20      6     6    (N)   1199    clear     none 
     19:00    29    18      7    73  (ENE)    602    clear     none 
     20:00    29    20      1   333  (NNW)           clear     none 
     21:00    29    19      6    19  (NNE)           clear     none 
     22:00    29    19      1   254  (WSW)   1118    clear     none 
     23:00    28    18      1   236   (SW)           clear     none 
     00:00    28    17      6   327  (NNW)           clear     none 
     01:00    33     7      7   343  (NNW)    559    clear     none 
     02:00    31     4      5   357    (N)    494    clear     none 
     03:00    34    -1      3   344  (NNW)    350    clear     none 
     04:00    36   -11      1   161  (SSE)    283    clear     none 
     05:00    38   -14      6    92    (E)    152    clear     none 
     06:00    38   -12      1   188    (S)     65    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: 3.1.8