Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, May 31, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
GS03  T.Henry           J.Davidson,J.Winters,J.Beck
GS03  T.Henry           J.Davidson,J.Winters,J.Beck

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
GS03  DSSI           20:15   00:20   
GS03  DSSI           02:20   05:47

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
GS03/O      20:15  01:10    0  0.8    0    0   0.6  3.5   0    0
GS03/O      01:10  05:47    0  1.2    0    0   0.0  3.4   0    0

note: scheduled times listed include instrument change time

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

Clear night throughout with no 3.5m telescope or instrument issues. Closed due to pollen spiking around 00:20. Pollen calmed down and stabilized by 02:20.

ARCSAT was unable to slew, opened a PR describing issue in more detail.

                    ------- 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
--------------------------------------------------------------------------
 20:25 dssi   419( 1788) 217  73  16.8 18.6 18.0 18.1 16.9   692nm  0.60

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    67    22     12   184    (S)   1168    clear     none 
     17:00    70    21      7   232   (SW)   1090    clear     none 
     18:00    70    20     10   233   (SW)   1095    clear     none 
     19:00    68    20      9   225   (SW)   1063    clear     none 
     20:00    63    18      4   253  (WSW)   1223    clear     none 
     21:00    62    18      6   233   (SW)   1194    clear     none 
     22:00    62    17      5   248  (WSW)   1202    clear     none 
     23:00    62    18      8   233   (SW)   1222    clear     none 
     00:00    57    29     15   143   (SE)   1215    clear     none 
     01:00    55    33     18   132   (SE)   2380    clear     none 
     02:00    55    33     15   123  (ESE)   2084    clear     none 
     03:00    56    32     11   137   (SE)   1901    clear     none 
     04:00    58    30     13   167  (SSE)   1785    clear     none 
     05:00    57    29      7   183    (S)   1725    clear     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