Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, August 25, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
CU05  A.Stephens        A.Stephens            
UW06  C.Chandler        I.Chow,C.Chandler,J.Murtagh

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU05  KOSMOS         21:29   23:55   
UW06  ARCTIC         --:--   --:--

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU05/R      19:45  01:10    0   3.0   0    0   0.0  2.4   0    0
UW06/R      01:10  06:26   1.4  3.9   0    0   0.0  0.0   0    0

note: scheduled times listed include instrument change time

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

Stayed closed at the start of the night due to nearby rain. We were only able to stay open for a few hours before clouds and radar came back in. Despite high hopes we didn't get on sky during B-half, we gave up around 05:00. 


I had to thump the ThAr power supply at checkout again today, and echelle exposures continue to show read noise. 


                    ------- 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
--------------------------------------------------------------------------
 21:53 kosmos   370( 1471)  82  28  19.9 20.8 21.8 20.3 19.8   --  1.75

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    78    38      6   240  (WSW)   2312  ptly cldy   none 
     17:00    73    39      5   158  (SSE)   2235  ptly cldy lt rain
     18:00    72    39     22   150  (SSE)   1886  ptly cldy   none 
     19:00    72    37     11   113  (ESE)   1576  ptly cldy   none 
     20:00    70    38      9   101    (E)   2120    clear     none 
     21:00    68    38     12   111  (ESE)   2348    clear     none 
     22:00    68    35     15   107  (ESE)   2304    clear     none 
     23:00    67    30      8    99    (E)   2696 mstly clr    none 
     00:00    66    30     12   114  (ESE)   2413  ptly cldy   none 
     01:00    69    31     11   109  (ESE)   2395  ptly cldy   none 
     02:00    69    33      8   116  (ESE)   2372 mstly cldy   none 
     03:00    68    31      3   111  (ESE)   2085 mstly cldy   none 
     04:00    66    33     13   136   (SE)   2037 mstly cldy   none 
     05:00    65    33     10   113  (ESE)   1809 mstly cldy   none 
     06:00    65    31     11   152  (SSE)   1451 mstly 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  ----------

Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 3.2.2