Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, December 24, 2025

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
CU01  A.Kowalski        M.Schutte,J.Libby-Roberts
CU01  A.Kowalski        J.Libby-Roberts       

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU01  ARCTIC         17:12   00:40              

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU01/R      17:12  00:10    0    0    0    0   2.6  4.4   0    0
CU01/R      00:10  06:55    0    6.3   0    0   0.5  0.0   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: T.Sutherland

Had to do an arctic init which resulted in dropping the upper left quad at 21:20. Tried switching from 4x4 quad to 2x2 LL mode and it got stuck with the following errors.

set amp=LL failed: Exception=RuntimeError; Text="busy"
object tim... failed: exposeTxt="cannot start a new arctic exposure while another is active"

Observer used LL mode for remainder of their time. My plan is to recover the quad on the 26th while arctic is not in use. 

Closed just after 00:30 due to an incoming storm. We never opened again. Gave up at 5am.

Merry Christmas to those who celebrate!

                    ------- 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
--------------------------------------------------------------------------
 17:33 arctic   500( 1251) 184  28   9.1 11.1 10.7 10.4  9.1   Semrock  1.11
 21:26 arctic   487( 1080) 177  27   8.7  7.8  8.5  7.8  8.1   Semrock  0.89


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    54    23      9   249  (WSW)    841 mstly clr    none 
     17:00    49    23      6   258  (WSW)    926 mstly clr    none 
     18:00    48    22     10   267    (W)    916  ptly cldy   none 
     19:00    48    22     10   265    (W)    836 mstly clr    none 
     20:00    47    24     12   268    (W)    713    clear     none 
     21:00    48    27     13   260    (W)    641    clear     none 
     22:00    47    26     14   272    (W)    831  ptly cldy   none 
     23:00    46    23     13   272    (W)   1092  ptly cldy   none 
     00:00    44    29     17   300  (WNW)    969  ptly cldy   none 
     01:00    43    30     15     5    (N)    993 mstly clr    none 
     02:00    43    33     22   306   (NW)    495  ptly cldy   none 
     03:00    45    32     19   276    (W)    527 mstly cldy   none 
     04:00    43    32     22   299  (WNW)    594 mstly cldy   none 
     05:00    43    32     20   300  (WNW)    638 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