Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, September 04, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UW06  C.Chandler        C.Chandler,I.Chow,J.Murtagh
NM06  W.Roberson        E.Serviss,A.Smith     
AP01  S.Merkowitz       T.Sutherland,R.McMillan

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW06  ARCTIC         21:35   01:11   
NM06  ECHELLE        01:16   05:26
AP01  APOLLO         05:34   06:32

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW06/R      19:32  01:10   2.0   0    0    0   2.8  0.8   0    0
NM06/R      01:10  05:32    0    0    0    0   0.0  4.4   0    0
AP01/W      05:32  06:32    0    0    0    0   0.0  1.0   0    0

note: scheduled times listed include instrument change time

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

Stayed closed at sunset due to a thunderstorm just east of us. We had clouds in and out all night as well as elevated humidity, but arcsecond seeing for most of the night. 

Echelle tilts likely need to be adjusted for pointing. 


                    ------- 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
--------------------------------------------------------------------------
 21:48 arctic   300( 1253)  -4  47  16.6 17.9 18.2 17.9 16.6   SDSS_r  0.97
 23:05 arctic   500( 1366) -30  56  16.1 16.2 16.8 16.1 15.9   SDSS_r  0.73
 01:23 ecamera    378(  218)  -4  31  15.2 15.2 15.8 15.2 15.3   ND3  0.94
 05:42 APOLLO     328( 1864)  87  66  15.0 14.4 15.1 14.2 14.5   530  1.00

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    68    51      7   255  (WSW)    921 mstly clr    none 
     17:00    68    50      9   211  (SSW)    820 mstly clr    none 
     18:00    69    50      4   220   (SW)    718 mstly clr    none 
     19:00    63    50      6   248  (WSW)    636 mstly clr    none 
     20:00    62    49      4   261    (W)    667 mstly clr    none 
     21:00    63    48      1   233   (SW)    634 mstly clr    none 
     22:00    62    50      7   192  (SSW)    625 mstly cldy   none 
     23:00    61    52      6   189    (S)        mstly cldy   none 
     00:00    60    53      5   196  (SSW)        mstly cldy   none 
     01:00    60    53      5   192  (SSW)         ptly cldy   none 
     02:00    60    52      4   213  (SSW)         ptly cldy   none 
     03:00    60    51      3   215   (SW)         ptly cldy   none 
     04:00    59    51      2   209  (SSW)         ptly cldy   none 
     05:00    60    51      2   235   (SW)        mstly clr    none 
     06:00    59    51      3   194  (SSW)        mstly clr    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