Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, September 02, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
WY01  M.Moe             S.Dandu               
UV01  R.Squillace       R.Squillace           
UW01  P.Yoachim         D.Meng,Z.Liu          

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
WY01  KOSMOS         19:35   21:21   
UV01  ARCTIC         00:45   03:55
UW01  KOSMOS (backup instrument, TripleSpec)04:05   05:40

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
WY01/R      19:35  01:10  1.1  2.3    0    0   1.8  0.4   0    0
UV01/R      01:10  04:10    0    0    0    0   0.0  3.0   0    0
UW01/R      04:10  06:31    0    0    0    0   0.0  2.3   0    0

note: scheduled times listed include instrument change time

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

Light clouds to start the night, gradually progressing into heavy cloud that produced some rain forcing closure at 21:21. Managed to open again at 00:45, but this was too late for WY01 to get useful data so time was donated to UV01. 

Telescope and instruments were well behaved right up until the end when the Echelle IOL measurements came back weird. The salt and pepper noise appears to be back, mentioned in separate email.

                    ------- 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
--------------------------------------------------------------------------
 20:07 kosmos   480( 1551)  52  29  17.9 20.1 19.1 19.5 18.3   --  1.70
 00:54 arctic   400( 1289) 179  53  15.8 16.7 17.1 16.7 15.5   u  2.13


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    71    45     10   268    (W)    819  ptly cldy   none 
     17:00    69    45     11   253  (WSW)    807  ptly cldy   none 
     18:00    71    48      8   264    (W)    877  ptly cldy   none 
     19:00    67    46     10   233   (SW)   1298  ptly cldy   none 
     20:00    64    45      3   206  (SSW)   1108 mstly cldy   none 
     21:00    64    44      4   219   (SW)    841   cloudy     none 
     22:00    64    45      3   202  (SSW)    977   cloudy     none 
     23:00    64    44      9   226   (SW)   1183   cloudy     none 
     00:00    64    44      9   208  (SSW)   1098 mstly cldy   none 
     01:00    61    45     10   178    (S)   1152    clear     none 
     02:00    62    45      6   183    (S)   1391    clear     none 
     03:00    63    44      7   199  (SSW)   1054  ptly cldy   none 
     04:00    62    43     10   227   (SW)   1008 mstly clr    none 
     05:00    62    43      5   260    (W)    999 mstly clr    none 
     06:00    62    42      7   269    (W)    859  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