Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, September 16, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UW04  C.Chandler        C.Chandler            
UV03  S.Majewski        J.Davidson,G.Hartwell,E.Breier

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW04  ARCTIC         --:--   --:--   
UV03  DSSI           --:--   --:--

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW04/R      19:16  01:10   2.8  3.1   0    0   0.0  0.0   0    0
UV03/R      01:10  06:40   5.5   0    0    0   0.0  0.0   0    0

note: scheduled times listed include instrument change time

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

Rain, lightning, clouds, threat of more rain, and sometimes high humidity kept us closed.  

We revisited the guider/slitviewer licensing issue at the start of the night, but once that was resolved everything else worked well.

                    ------- 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
--------------------------------------------------------------------------


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    62    52     14   193  (SSW)          cloudy     none 
     17:00    62    52      6   165  (SSE)   1555   cloudy     none 
     18:00    60    50     15   144   (SE)   1279   cloudy   lt rain
     19:00    57    53     16   118  (ESE)          cloudy     rain 
     20:00    58    53     17   121  (ESE)          cloudy     rain 
     21:00    56    54     20   119  (ESE)          cloudy   lt rain
     22:00    56    54     17   113  (ESE)          cloudy    humid 
     23:00    56    53     25   119  (ESE)          cloudy    humid 
     00:00    55    53     13   194  (SSW)          cloudy    humid 
     01:00    56    51     22   106  (ESE)          cloudy    humid 
     02:00    55    51     21   121  (ESE)          cloudy    humid 
     03:00    57    48     26   143   (SE)          cloudy     none 
     04:00    55    48     18   136   (SE)          cloudy     none 
     05:00    55    49     17   181    (S)          cloudy     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