Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, August 19, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan,H.Abbot    
UW07  S.Hawley          S.Hawley              
CU04  A.Kowalski        A.Kowalski            

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         19:50   20:46   
UW07  ECHELLE        20:51   22:33
CU04  KOSMOS         02:24   05:39

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/W      19:52  20:52    0    0    0    0   0.0  1.0   0    0
UW07/R      20:52  01:10   1.5  1.2   0    0   0.0  1.7   0    0
CU04/R      01:10  06:22   1.2   0    0    0   4.0  0.0   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend

ThAr lamp power supply needed to be thumped at checkout to work. IOL exposures from this morning are noisier looking than usual. Neither of these things affected observations. 

Tertiary behaved itself on all inst changes tonight. 

We had clouds of varying thickness all night long and had to close up in the middle of the night for nearby storms. 


                    ------- 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
--------------------------------------------------------------------------
 19:59 APOLLO     600( 2473) -13  33  20.4 21.1 20.6 21.0 20.5   530  1.30
 21:00 ecamera    450(  514)  51  41  20.1 20.2 20.3 20.0 19.8   ND1  0.95
 02:36 klow   275( 1196) 274  69  16.5 17.5 17.9 17.2 16.5   --  1.47


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    66    42      7   110  (ESE)    791  ptly cldy   none 
     17:00    71    45     11   228   (SW)   1792  ptly cldy   none 
     18:00    71    44      5   250  (WSW)   1625  ptly cldy   none 
     19:00    70    42      8   221   (SW)   1625  ptly cldy   none 
     20:00    68    41      6   180    (S)   1719 mstly cldy   none 
     21:00    68    40      6   178    (S)   1616 mstly cldy   none 
     22:00    68    39      5   185    (S)   1611 mstly cldy   none 
     23:00    67    39     11   181    (S)   1720 mstly cldy   none 
     00:00    67    39     10   122  (ESE)   1658 mstly cldy   none 
     01:00    65    39     13    87    (E)   1884  ptly cldy   none 
     02:00    62    42     15    80    (E)   2403 mstly clr    none 
     03:00    62    41     13    81    (E)   2395 mstly clr    none 
     04:00    62    41     20    74  (ENE)   2169  ptly cldy   none 
     05:00    60    43     19    75  (ENE)   1804  ptly cldy   none 
     06:00    59    43     11    82    (E)   2041  ptly cldy   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