Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, May 15, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
CU04  A.Kowalski        A.Kowalski            
WY01  M.Brotherton      M.Brotherton,K.Zhang  
UV01  R.Squillace       R.Squillace           

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU04  KOSMOS         20:05   01:10   
WY01  KOSMOS         01:10   02:40
UV01  KOSMOS         02:45   05:28

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU04/R      20:04  01:10    0    0    0    0   5.1  0.0   0    0
WY01/R      01:10  02:50    0    0    0    0   1.7  0.0   0    0
UV01/R      02:50  05:55    0    0    0    0   2.7  0.4   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot,R.McMillan

Clear and smooth observing night with no 3.5m telescope or instrument issues.

Had to zenith Arcsat because it slewed into its limit immediately.

                    ------- 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
--------------------------------------------------------------------------
 20:45 klow     631( 1462)  57  65  13.8 15.6 15.7 15.1 14.2   --  1.30

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    63    25     27   253  (WSW)    786    clear     none 
     17:00    65    25     12   248  (WSW)   1141    clear     none 
     18:00    63    21     19   265    (W)   1209    clear     none 
     19:00    62    19     19   246  (WSW)    921    clear     none 
     20:00    59    17     16   264    (W)    758    clear     none 
     21:00    57    15     12   256  (WSW)    503    clear     none 
     22:00    57    13     12   228   (SW)    476    clear     none 
     23:00    57    12     10   253  (WSW)    640    clear     none 
     00:00    57    13     12   265    (W)    677    clear     none 
     01:00    57    13     12   263    (W)    688    clear     none 
     02:00    56    10     12   262    (W)    741    clear     none 
     03:00    55    10      8   263    (W)    720    clear     none 
     04:00    55     8     10   266    (W)    713    clear     none 
     05:00    54     8      7   272    (W)    746    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