Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, December 16, 2025

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
BY04  A.Mosenkov        A.Mosenkov            
JH05  C.Lisse           C.Lisse,C.Ingebertson,G.Jewett,M.Kilic,M.Belyakov

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
BY04  KOSMOS         17:57   23:59   
JH05  KOSMOS         00:01   01:22
JH05  ARCTIC         01:35   04:04
JH05  KOSMOS         04:19   06:04

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
BY04/R      17:08  00:10    0    0    0    0   7.0  0.0   0    0
JH05/R      00:10  06:51    0    0    0    0   4.8  1.9   0    0

note: scheduled times listed include instrument change time

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

ToO was called in by JH05, so GS01 that was originally scheduled was not on. 

Arctic ion pump failed and was noticed around 4am. Arctic was just coming off the telescope when I noticed the failure. Email has been sent with images.

Wind was a pest for about three quarters of the night, but it never got so bad that we had to close. It made seeing extremely variable though.

Cals were being taken at the beginning of the night which delayed opening. 


                    ------- 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 kosmos   574(  968) 321  69   5.9  6.3  6.7  6.2  5.7   --  0.95
 00:13 kosmos   449(  824) -128  35   6.9  5.5  6.1  5.7  6.2   --  2.32
 01:41 arctic   437(  949) -134  21   6.9  5.9  6.6  6.3  6.6   SDSS_r  3.50
 02:54 arctic   536( 1021)  60  47   6.6  5.9  6.5  6.1  6.4   SDSS_r  1.17
 04:30 kosmos   486(  872)  27  54   7.1  6.0  6.7  5.9  6.6   --  1.03


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    42     7      2   359    (N)    284 mstly clr    none 
     17:00    43     1     13   355    (N)    183    clear     none 
     18:00    43     3     24    27  (NNE)    197    clear     none 
     19:00    43     2     16     4    (N)    183    clear     none 
     20:00    43     1     24    15  (NNE)    181    clear     none 
     21:00    43     2     19    26  (NNE)    175    clear     none 
     22:00    44     4     12    21  (NNE)    132    clear     none 
     23:00    45     2      5    61  (ENE)     99    clear     none 
     00:00    44     0     26    74  (ENE)    188    clear     none 
     01:00    45    -3     28    74  (ENE)    101    clear     none 
     02:00    45    -2     11    30  (NNE)    110    clear     none 
     03:00    44    -2     16    74  (ENE)     92    clear     none 
     04:00    45     2     15    72  (ENE)    114    clear     none 
     05:00    45     3     14    59  (ENE)    131    clear     none 
     06:00    44     1      1   220   (SW)    121    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