Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, January 02, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UV01  D.Demars          Y.Zhou,D.Demars       
BY05  E.Hintz           D.Stephens,M.Gee      

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UV01  TripleSpec     17:30   00:10   
BY05  TripleSpec     00:13   06:10

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UV01/R      17:18  00:10    0    0    0    0   0.0  6.9   0    0
BY05/R      00:10  06:57    0    0    0    0   0.0  6.8   0    0

note: scheduled times listed include instrument change time

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

A lovely peacegul night with not-quite-photometric skies, but the clouds were thin enough 
to work through even in the IR.  Both programs had a productive night of observing.

One of the instrument UPSes reported a fault during second half, but there was no drop 
of power and the attached instruments appear to be fine.

                    ------- 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
--------------------------------------------------------------------------
 17:35 tcamera    481( 1082)  45  38   2.4  4.9  4.9  5.1  2.6     1.27
 00:19 tcamera    504(  911) -139  51   2.9  1.1  2.3  1.7  2.4   Ks  1.06

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    39    -1     17   323   (NW)    174    clear     none 
     17:00    38    -1     15   301  (WNW)    173    clear     none 
     18:00    36    -4     11   303  (WNW)    266    clear     none 
     19:00    37    -4     19   317   (NW)    256    clear     none 
     20:00    37    -4     17   337  (NNW)    278    clear     none 
     21:00    37    -4     13   350    (N)    193    clear     none 
     22:00    36    -5     12    11    (N)    171    clear     none 
     23:00    36    -5     15    29  (NNE)    112    clear     none 
     00:00    36    -5     19     9    (N)     95 mstly clr    none 
     01:00    36    -4     11     7    (N)     92 mstly clr    none 
     02:00    39    -2     21    23  (NNE)     80 mstly clr    none 
     03:00    42    -1     13    14  (NNE)     68 mstly clr    none 
     04:00    41    -2     13    24  (NNE)     67 mstly clr    none 
     05:00    42    -1      1   266    (W)     43 mstly clr    none 
     06:00    46     3      5    96    (E)     26 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: 3.1.8