Apache Point Observatory
                      3.5m Telescope Night Log
                      Saturday, July 25, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
EN02  C.Smith           A.Townsend,R.McMillan 

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
EN02  ARCTIC         21:15   02:00   
EN02  SHACK          02:00   04:00

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
EN02/W      20:15  01:10    0   1.0   0    0   0.0  3.9   0    0
EN02/W      01:10  06:04    0    0    0    0   2.7  2.2   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend

Surprisingly decent weather tonight with pretty good seeing. 

Shutdown recovery engineering: 
- Drive resets
- NA2 rotator zeroed (-0.085)
- Course collimation of the primary
- Fine collimation with Shack-Hartmann

ARCTIC LL saturation at checkout, cleared up in a few hours. 

Tert rotation to TR4 failed with error: 
2026-07-26 07:45:34 .telmech.0 0 telmech w RawLine="?LMSTOP clamp failed to fully close\""
Russet adjusted tert position manually. 

Be aware ARCTIC fan cord is lying across floor on NA2 side of dome. 

                    ------- 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
--------------------------------------------------------------------------
 23:18 arctic   423( 1477) 169  57  18.2 18.1 18.7 17.9 18.0   SDSS_g  1.07
 01:28 arctic   336( 1358) 182  58  17.7 17.4 18.1 17.3 17.4   SDSS_g  0.99
 02:54 shack   261( 1878) 199  60  17.1 16.8 17.4 16.6 16.8   --  1.10

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    64    55     13   117  (ESE)         ptly cldy   none 
     17:00    70    56      8    82    (E)   2750 mstly clr    none 
     18:00    71    54     12   111  (ESE)   2668 mstly clr    none 
     19:00    70    49     12   118  (ESE)   2418 mstly clr    none 
     20:00    67    48     12   113  (ESE)   2514    clear     none 
     21:00    67    44     16   113  (ESE)   2182    clear     none 
     22:00    66    44     13    91    (E)   1912    clear     none 
     23:00    64    47     15   109  (ESE)   1969 mstly clr    none 
     00:00    66    48     17   137   (SE)   2120 mstly clr    none 
     01:00    63    49     15   148  (SSE)   2172 mstly clr    none 
     02:00    63    51     13   173    (S)   1617 mstly clr    none 
     03:00    63    51     11   182    (S)   1324 mstly clr    none 
     04:00    63    50      8   225   (SW)   1339 mstly clr    none 
     05:00    62    49      5   256  (WSW)   1295 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.

              ----------  TELESCOPE SOFTWARE  ----------

Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 3.2.2