Apache Point Observatory
                      3.5m Telescope Night Log
                      Thursday, September 17, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan            
UV04  J.Davidson        J.Davidson,G.Hartwell 
                                              

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         --:--   --:--   
UV04  DSSI           --:--   --:--
                             

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/R      19:15  20:15    0  1.0    0    0   0.0  0.0   0    0
UV04/R      20:15  01:10  2.1  2.9    0    0   0.0  0.0   0    0
UV04/R      01:10  06:41  5.5    0    0    0   0.0  0.0   0    0

note: scheduled times listed include instrument change time

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

stripchart-mac was hung and needed rebooting at start of night.
Power outage in the afternoon meant mirror covers needed a restart come checkout.
Echelle salt and pepper noise returned by the morning IOL measurement.

Nearby rain and high dust counts kept us closed all 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
--------------------------------------------------------------------------


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    69    53     11   230   (SW)   5881   cloudy     none 
     17:00    62    46      3   252  (WSW)   6186   cloudy     rain 
     18:00    64    50      9   191    (S)   5997   cloudy     none 
     19:00    60    50      7   174    (S)          cloudy     rain 
     20:00    52    50     27   179    (S)          cloudy     rain 
     21:00    53    48     14    90    (E)          cloudy     none 
     22:00    53    49     24    73  (ENE)          cloudy     none 
     23:00    55    50     18   113  (ESE)          cloudy     none 
     00:00    56    50      2   207  (SSW)          cloudy     none 
     01:00    56    50     11   116  (ESE)          cloudy     none 
     02:00    56    50     16   132   (SE)         ptly cldy   none 
     03:00    56    49     18   147  (SSE)          cloudy     dust 
     04:00    58    47     21   182    (S)   7545 mstly cldy   dust 
     05:00    56    48     14   171    (S)        mstly clr    dust 



     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