Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, June 09, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
WY01  M.Brotherton      K.Zhang,M.Brotherton  
CU01  A.Stephens        A.Stephens           

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
WY01  KOSMOS         --:--   --:--   
CU01  KOSMOS         01:01   05:20

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
WY01/R      20:19  23:20  3.0    0    0    0   0.0  0.0   0    0
CU01/R      23:20  01:10  1.7    0    0    0   0.1  0.0   0    0
CU01/R      01:10  05:46    0    0    0    0   1.0  3.6   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot

ARCTIC LL quad was funky again tonight during checkout around 1700. Left it to the end of the night to test again to see if the issue is based on time between exposures, but no issue with the quad at 0500.

Spots of rain all around for majority of A-half, but was able to open just in time for B-half. Night went pretty smoothly once open. No other telescope or instrument issues to report.

Corrected pointing of Arcsat when we got on sky. 

                    ------- 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
--------------------------------------------------------------------------
 01:12 kosmos   433( 1370) -24  73  18.0 17.9 19.4 17.9 17.8   --  1.20


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

                               Wind                      Precip.or
Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
------------------------------------------------------------------

 16:00    70    45     16   243  (WSW)   1641   cloudy     rain 
 17:00    63    49     20   248  (WSW)   1825   cloudy     rain 
 18:00    67    42     15   262    (W)   2010   cloudy     none 
 19:00    71    42     11   262    (W)   1800   cloudy     none 
 20:00    68    38     17   218   (SW)   1708 mstly cldy   none 
 21:00    66    42     12   158  (SSE)   1756 mstly cldy   none 
 22:00    62    45     18   124   (SE)   2467   cloudy     rain 
 23:00    64    45     18   157  (SSE)   2285 mstly cldy   none 
 00:00    64    43     20   180    (S)   1962  ptly cldy   none 
 01:00    64    42     15   203  (SSW)   1818 mstly clr    none 
 02:00    63    43     17   190    (S)   1932 mstly clr    none 
 03:00    63    43     13   201  (SSW)   2290    clear     none 
 04:00    62    43     14   216   (SW)   2353    clear     none 
 05:00    62    43      6   199  (SSW)   2542    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