Apache Point Observatory
                      3.5m Telescope Night Log
                      Saturday, October 10, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
CU01  A.Stephens        A.Stephens            
BY03  E.Hintz           G.Steed               

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU01  KOSMOS         --:--   --:--   
BY03  TSPEC          04:35   06:15

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU01/R      18:45  01:10   6.4   0    0    0   0.0  0.0   0    0
BY03/R      01:10  06:56   3.4   0    0    0   2.4  0.0   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan

First half had more clouds and nearby rain than expected, and then we even got some of the rain at APO.  Once the radar passed by, the clouds continued to be pretty thick for hours longer.  Finally they began to thin and I opened for observations with Tspec.  The clouds were still patchy and interfering with  the focus script, so I focused by hand instead.  After that it was a struggle to keep guiding, but some useful data did come in.

NICFPS noise looked high at afternoon checkout, so I power cycled the Leach controller, and afterward it seemed better.  I did not take regular images with ARCTIC, only spot-checks, but by dawn the LL quad was part-recovered from saturation, but not back to normal.


                    ------- 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
--------------------------------------------------------------------------
 04:55 tcamera    425( 1316) 204  64  11.5 11.6 12.4 11.6 11.4   Ks  0.73


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    57    47     12   187    (S)         ptly cldy   none 
     17:00    55    47      9   185    (S)         ptly cldy   none 
     18:00    55    47     12   174    (S)         ptly cldy   none 
     19:00    53    47     16   146   (SE)        mstly cldy   none 
     20:00    54    46     17   146   (SE)          cloudy     none 
     21:00    54    44     15   155  (SSE)          cloudy   lt rain
     22:00    54    43     13   183    (S)          cloudy   lt rain
     23:00    51    45     18   148  (SSE)          cloudy     none 
     00:00    53    43     19   181    (S)          cloudy     none 
     01:00    53    44     17   172    (S)    341   cloudy     none 
     02:00    53    43     20   181    (S)          cloudy     none 
     03:00    53    43     28   191    (S)        mstly cldy   none 
     04:00    53    43     27   201  (SSW)    350  ptly cldy   none 
     05:00    53    43     29   186    (S)    320 mstly clr    none 
     06:00    52    43     21   191    (S)           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  ----------

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