Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, June 10, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
BY02  S.Bahr            S.Bahr,J.Guerrette,J.Seguine
GS02  D.Gies            A.Chaturvedi          
AP01  S.Merkowitz       T.Sutherland,R.McMillan

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
BY02  KOSMOS         21:10   01:03   
GS02  ECHELLE        01:10   03:06
GS02  ECHELLE        04:32   04:46
AP01  APOLLO         04:50   05:37

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
BY02/R      20:20  01:10    0    0    0    0   4.8  0.0   0    0
GS02/R      01:10  04:46    0  1.5    0    0   1.5  0.6   0    0
AP01/R      04:46  05:46    0    0    0    0   0.0  1.0   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot

Started late because targets were faint, so ran darks until 12 deg twilight. Mostly clear A-half with clouds slowly rolling in through B-half. Pollen spike forced closure just past 0300. Was able to open again by 0430. 

Had a motion error slewing in place after first opening. Was resolved be reinitialising axes. 

Arcsat ran into limit and had to be pushed off manually. After this, wasn't able to zenith because the hand paddle controls wouldn't slew north or east (instead going south and west respectively). Tried powercycling MDC but this didn't solve it, so had to close up for 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
--------------------------------------------------------------------------
 21:23 kosmos   575( 1683) 121  68  20.1 21.5 21.6 21.3 19.7   --  1.29
 23:47 kosmos   527( 1528) 321  54  19.6 19.1 19.7 18.9 19.2   --  0.85
 01:30 ecamera    577(  555) 238  67  19.2 18.8 19.4 18.7 18.8   ND2  0.75
 04:55 APOLLO     427( 2143)  78  45  16.9 17.4 18.4 17.4 17.5   530  1.50

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    74    36     14   261    (W)   1322    clear     none 
     17:00    75    35     16   228   (SW)   1013    clear     none 
     18:00    77    38     15   242  (WSW)   1069 mstly clr    none 
     19:00    72    33     16   247  (WSW)   1112  ptly cldy   none 
     20:00    71    35     17   237  (WSW)   1159    clear     none 
     21:00    69    32     19   240  (WSW)   1241    clear     none 
     22:00    68    31     10   255  (WSW)    895    clear     none 
     23:00    67    31      9   241  (WSW)   1164    clear     none 
     00:00    67    30     14   244  (WSW)   1033 mstly clr    none 
     01:00    67    27     10   262    (W)    834 mstly clr    none 
     02:00    66    24      9   265    (W)    826  ptly cldy   none 
     03:00    65    25      9   260    (W)    808  ptly cldy   none 
     04:00    64    30      9   229   (SW)   1028  ptly cldy   none 
     05:00    62    33      5   248  (WSW)   1321 mstly 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: 3.1.8