Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, April 26, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan            
UW08  S.Hawley          S.Hawley, L.Hebb                                                    

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         --:--   --:--   
UW08  ECHELLE        23:00   05;39                             

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/R      19:50  20:50    0   1.0   0    0   0.0  1.0   0    0
UW08/R      20:50  06:11    0   2.2   0    0   2.0  5.1   0    0

note: scheduled times listed include instrument change time

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

Dust and high winds at the start of the night.

We finally opened at 23:00.

No 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
--------------------------------------------------------------------------
 23:10 ecamera    508(   33)  14  74   6.9  9.2 11.0  9.2  7.1   ND1  1.19
 23:47 ecamera    545(   11) -11  46   6.6  7.6  9.2  7.3  6.6   ND2  1.60

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------	
     16:00    57    23     42   263    (W)  32119  ptly cldy   dust 
     17:00    57    21     35   259    (W)  37461  ptly cldy   dust 
     18:00    56    21     38   265    (W)  46946  ptly cldy   dust 
     19:00    54    20     35   253  (WSW)  42991  ptly cldy   dust 
     20:00    51    18     32   248  (WSW)  19969 mstly cldy   dust 
     21:00    49    15     27   258  (WSW)   7060 mstly cldy   dust 
     22:00    46    14     18   266    (W)  13846 mstly cldy   dust 
     23:00    45    16     19   276    (W)   3838 mstly clr    none 
     00:00    44    17     24   254  (WSW)   2871    clear     none 
     01:00    43    18     21   266    (W)   2497    clear     none 
     02:00    41    20     16   270    (W)   2143    clear     none 
     03:00    40    20     18   266    (W)   2258    clear     none 
     04:00    39    21      7   298  (WNW)   2331    clear     none 
     05:00    38    21     23   292  (WNW)   2201    clear     none 
     06:00    37    19     28   289  (WNW)   2041    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