Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, June 23, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
WY01  M.Brotherton      M.Brotherton          
CU01  A.Stephens        A.Stephens            
NM08  A.Peck            A.Peck,A.Abbas        

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
WY01  KOSMOS         20:51   22:29   
CU01  KOSMOS         22:31   03:20
NM08  ECHELLE        03:25   05:29

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
WY01/R      20:24  22:30    0    0    0    0   0.0  2.1   0    0
CU01/R      22:30  01:10    0    0    0    0   0.0  2.7   0    0
CU01/R      00:10  04:10    0    0    0    0   1.4  1.9   0    0
NM08/R      04:10  05:48    0    0    0    0   2.3  0.0   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend

ARCTIC LL saturated at checkout; recovered after a few hours. 

Annoying clouds in the middle of the night. CU01 stopped early and handed over since they had what they needed and the weather wasn't cooperating; OBS times reflect this 0.7 hr change. 


                    ------- 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
--------------------------------------------------------------------------
 21:05 khigh   350( 1606) 248  80  22.9 24.8 24.6 24.3 23.0   --  0.74
 22:42 kosmos   410( 1578) -85  51  22.8 22.6 23.0 22.4 22.4   --  0.87
 03:32 ecamera    550(  534)  42  52  19.0 18.7 19.4 18.6 18.7   ND2  1.43


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    79    33     15   267    (W)    747    clear     none 
     17:00    83    33     14   254  (WSW)    662    clear     none 
     18:00    78    31      9   283  (WNW)    535    clear     none 
     19:00    78    30     11   263    (W)    530    clear     none 
     20:00    75    26      7   260    (W)    659    clear     none 
     21:00    73    25      2   249  (WSW)    685    clear     none 
     22:00    71    24      5   250  (WSW)    754 mstly clr    none 
     23:00    70    26      9   218   (SW)    763  ptly cldy   none 
     00:00    72    25      9   202  (SSW)    900  ptly cldy   none 
     01:00    67    39     18   135   (SE)   1493  ptly cldy   none 
     02:00    66    40     12   132   (SE)   1628  ptly cldy   none 
     03:00    65    39     13   150  (SSE)   1546 mstly clr    none 
     04:00    67    36     15   180    (S)   1449 mstly clr    none 
     05:00    67    37     14   180    (S)   1219  ptly 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  ----------

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