Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, January 12, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UW09  C.Chandler        C.Chandler,M.Frissell 
OU01  G.Jewett          G.Jewett              

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW09  ARCTIC         18:00   00:04   
OU01  ARCTIC         00:06   06:38

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW09/R      17:26  00:10    0    0    0    0   6.7  0.0   0    0
OU01/R      00:10  06:57    0    0    0    0   2.7  4.1   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan

Weather was usable all night, but seeing and clouds varied quite a bit.  Both halves of the night got some good conditions and some bad conditions, and all went well with the 3.5m.

ARCSAT had some trouble at the start of the night, including a reboot and another restart of software to fix some broken connections.  The clock also needed to be adjusted by about 2 hours.  Once the pointing was fixed, everything went smoothly for the rest of the night.

                    ------- 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
--------------------------------------------------------------------------
 18:17 arctic   398(  797) -27  76   0.0  4.4  3.6  4.6  1.7   CUVR  0.94
 21:38 arctic   517(  731) 101  68   0.4  0.4  1.3  0.5  0.5   CUVR  1.27
 00:16 arctic   486(  706)  38  29   0.7 -0.1  0.6 -0.3  0.2   BG40  2.55

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    39     8      8   266    (W)    302 mstly clr    none 
     17:00    38    10      5   233   (SW)    452    clear     none 
     18:00    33    13      5   358    (N)    671    clear     none 
     19:00    34     5     10    60  (ENE)    209    clear     none 
     20:00    35    -3     17    58  (ENE)    113    clear     none 
     21:00    34    -4     17    72  (ENE)    137    clear     none 
     22:00    33     0      9    79    (E)    126 mstly clr    none 
     23:00    34     1     10    89    (E)     82  ptly cldy   none 
     00:00    34    -1      6    81    (E)     25  ptly cldy   none 
     01:00    32     3      2     4    (N)     84  ptly cldy   none 
     02:00    32     2      5    12  (NNE)     64  ptly cldy   none 
     03:00    33     1      2   336  (NNW)     54 mstly clr    none 
     04:00    33     0      8    39   (NE)     40    clear     none 
     05:00    34    -2      6   308   (NW)     31    clear     none 
     06:00    34    -2      3   359    (N)     41    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