Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, February 09, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
BY01  D.Stephens        D.Stephens + Class    
UW01  S.Hawley          L.Hebb                
                                              
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
BY01  Eyepiece       17:52   18:50   
BY01  TSPEC          18:50   23:52
UW01  ARCTIC         --:--   --:--

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
BY01/O     17:52  02:00   1.8  0.4   0    0   6.0  0.0   0    0
UW01/R     02:00  06:42    0   4.7   0    0   0.0  0.0   0    0

note: scheduled times listed include instrument change time

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

Enclosure humidity and temp on the Optidew seemed way off tonight.  Outside was reading 81% (3.9C) and the inside was reading 20% with a 11.1C inside temp (wrong) with the dome open several hours.

Humidity started climbing around 23:15  We closed at 23:52 due to humidity.  We never re-opened as there were clouds that were too close or the humidity was too close to limits, or over.

                    ------- 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
--------------------------------------------------------------------------
 19:06 tcamera    436( 1092) 242  79   5.1  6.7  6.6  6.1  5.2   Ks  1.08

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    49    15     11   200  (SSW)    396 mstly clr    none 
     17:00    47    17      8   243  (WSW)    490 mstly clr    none 
     18:00    43    14      7   202  (SSW)    436  ptly cldy   none 
     19:00    41    23      5   256  (WSW)    536  ptly cldy   none 
     20:00    40    27      7   192  (SSW)    689  ptly cldy   none 
     21:00    41    27     10   184    (S)    742 mstly clr    none 
     22:00    41    29      9   184    (S)    906 mstly clr    none 
     23:00    40    30     16   207  (SSW)         ptly cldy   none 
     00:00    39    33     12   204  (SSW)        mstly cldy  humid 
     01:00    39    32      6   199  (SSW)        mstly cldy  humid 
     02:00    41    31      5   329  (NNW)        mstly cldy   none 
     03:00    40    32      1   342  (NNW)        mstly cldy   none 
     04:00    38    32     10   224   (SW)        mstly cldy  humid 

     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: 3.1.8