Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, February 20, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan            
JH03  N.Myers           N.Myers               
UW05  B.Benda           B.Benda               

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         --:--   --:--   
JH03  ECHELLE        23:10   00:10
UW05  ECHELLE        00:10   05:52

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/R      18:02  19:02    0   1.0   0    0   0.0  0.0   0    0
JH03/R      19:02  00:10   1.6  2.5   0    0   1.0  0.0   0    0
UW05/R      00:10  06:32    0    0    0    0   6.4  0.0   0    0

note: scheduled times listed include instrument change time

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

Dust, clouds and wind kept us closed at the start.  Then clouds until around 23:00 and I finally opened shortly afterwards.  

I did not do morning Echelle IOL due to observer taking morning cals.

No telescope problems tonight.

                    ------- 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
--------------------------------------------------------------------------
 23:17 ecamera    413( -542)  93  46  -2.2 -1.3 -1.6 -2.0 -2.5   ND1  2.00
 00:16 ecamera    475( -502) -35  51  -1.9 -1.8 -2.0 -2.7 -2.6   ND1  1.50

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    37    15     30   254  (WSW)   6340 mstly cldy   dust 
     17:00    35    13     28   265    (W)   5234 mstly cldy   dust 
     18:00    32    14     19   256  (WSW)   2645 mstly cldy   dust 
     19:00    30    11     19   263    (W)   5330   cloudy     dust 
     20:00    30    13     21   276    (W)   2338 mstly cldy   none 
     21:00    29    16     22   298  (WNW)   1150 mstly cldy   none 
     22:00    28    10     15   296  (WNW)    503 mstly cldy   none 
     23:00    28    -2     17   284  (WNW)    428 mstly clr    none 
     00:00    28    -1     17   300  (WNW)    383    clear     none 
     01:00    27     2     14   294  (WNW)    458    clear     none 
     02:00    27     2      9   309   (NW)    515    clear     none 
     03:00    26     1     12   335  (NNW)    524    clear     none 
     04:00    26     2     16   311   (NW)    584    clear     none 
     05:00    28     1     18   337  (NNW)    543    clear     none 
     06:00    29    -5     10   336  (NNW)    492    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  ----------

Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 3.1.8