Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, October 21, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UV02  S.Majewski        J.Davidson            
GS03  T.Henry           J.Davidson  

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UV02  DSSI           18:32   21:50 
UV02  DSSI           22:10   01:00  
GS03  DSSI           02:00   03:20

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UV02/R      18:32  01:10   0.5   0    0    0   0.0  6.1   0    0
GS03/R      01:10  07:04   1.1  3.5   0    0   0.0  1.3   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: J.Dembicky

We fought clouds most of the night with a few clearing holes.  My observer observed through most of it and was able to get data despite the clouds, there were a few times he reported the clouds were too thick but we stayed open until Humidity finally closed us at 03:20.

@03:07 my TUI disconnected, just needed to log back in.  Remote observer TUI was fine.  My remote observer had been having intermittent drops tonight and the past couple of nights, but they did not loose connection when I did.

Humidity dropped shortly after we closed but the clouds stayed and we never re-opened for the remainder of the night.

                    ------- 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
--------------------------------------------------------------------------
 18:47 dssi   575( 1518) 224  77  12.9 13.8 14.1 13.6 13.1   692  0.60

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    63    47     11   186    (S)    152 mstly clr    none 
     17:00    59    46      4   189    (S)    127  ptly cldy   none 
     18:00    57    41     17   127   (SE)    116  ptly cldy   none 
     19:00    55    40     19   125   (SE)    117 mstly cldy   none 
     20:00    55    38     17   137   (SE)     87   cloudy     none 
     21:00    55    44     18   138   (SE)          cloudy     none 
     22:00    54    47     20   134   (SE)          cloudy     none 
     23:00    54    47     18   144   (SE)          cloudy     none 
     00:00    53    47     14   160  (SSE)        mstly cldy   none 
     01:00    54    46     18   161  (SSE)        mstly cldy   none 
     02:00    53    46     21   151  (SSE)        mstly cldy   none 
     03:00    53    46     18   146   (SE)        mstly cldy  humid 
     04:00    52    47     17   162  (SSE)          cloudy     none 
     05:00    52    47     22   159  (SSE)          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