Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, December 30, 2025

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       T.Sutherland          
UW02  P.Yoachim         D.Meng, Z.Xu          
UW04  S.Hawley          S.Hawley             
CU06  Z.Berta-Thompson  A.Stephens            

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         17:16   18:08   
UW02  KOSMOS         18:16   21:00
UW04  ECHELLE        21:04   00:10
CU06  KOSMOS         00:12   06:10

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/R      17:16  18:16    0    0    0    0   0.0  1.0   0    0
UW02/R      18:16  21:10    0    0    0    0   0.0  2.9   0    0
UW04/R      21:10  00:10    0    0    0    0   0.0  3.0   0    0
CU06/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: J.Dembicky

No problems tonight.

A very red/purple morning twilight this morning thanks to some thin cirrus in the east!

                    ------- 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
--------------------------------------------------------------------------
 17:20 APOLLO     525( 1745)  81  60   4.4  7.2  6.4  7.1  4.9   --  1.40
 18:31 kosmos   390(  734)  23  57   4.7  5.1  5.0  4.6  4.5   --  2.00
 21:13 ecamera    427( -285) -10  50   4.6  3.9  4.7  3.9  4.5   ND2  1.95
 00:21 kosmos   425(  735)  12  55   4.5  4.4  5.2  4.2  5.1   --  1.56

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    43     8      2   210  (SSW)    412 mstly clr    none 
     17:00    42     5      7    11    (N)    486 mstly clr    none 
     18:00    39    -5     10    32  (NNE)    698 mstly clr    none 
     19:00    41   -10     10     7    (N)    591    clear     none 
     20:00    38   -10      4   352    (N)    478    clear     none 
     21:00    40    -7      1   200  (SSW)    442    clear     none 
     22:00    40   -10     11     0    (N)    355    clear     none 
     23:00    44    -7      8    28  (NNE)    325    clear     none 
     00:00    44    -7      7   355    (N)    367    clear     none 
     01:00    42    -8      9    15  (NNE)    351    clear     none 
     02:00    43    -7      8    35   (NE)    294    clear     none 
     03:00    44    -5      6   356    (N)    323    clear     none 
     04:00    45    -5      1   357    (N)    299    clear     none 
     05:00    45    -5      6   352    (N)    301    clear     none 
     06:00    44    -7      3   335  (NNW)    310    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