Subject: 3.5m Night Log 20251011
From: ajt@apo.nmsu.edu
Date: Sun, 12 Oct 2025 11:46:55 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Saturday, October 11, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW05  C.Chandler        M.Frissell
JH03  N.Zakamska        D.Bizyaev
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW05  ARCTIC         --:--   --:--
JH03  ECHELLE        --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW05/R      18:43  01:10   3.4  3.1   0    0   0.0  0.0   0    0
JH03/R      01:10  06:57    0   5.8   0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend
Foggy rainstorm rolled in around 18:45 and continued throughout the entire night; we were unable to open.
Dewpoint around sunset reported incorrectly in Weather Log below (RH actually close to 100% all night long) and dust counts are incorrect (dust counter linked to misreporting dewpoint sensor).
Power cycled dataq at start of 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    56    48     13   201  (SSW)          cloudy     none
     17:00    55    41     12   197  (SSW)    781   cloudy     none
     18:00    55    31     12   223   (SW)    919   cloudy     rain
     19:00    51    32      7   270    (W)   1453   cloudy     rain
     20:00    51    33      8   266    (W)   1170   cloudy     rain
     21:00    50    33     11   272    (W)    218   cloudy     rain
     22:00    51    32     10   263    (W)    278   cloudy     rain
     23:00    50    32      9   249  (WSW)   3249   cloudy     rain
     00:00    50    32     12   260    (W)  14679   cloudy     rain
     01:00    50    32     13   230   (SW)  16646   cloudy     rain
     02:00    50    31     15   232   (SW)  20018   cloudy     rain
     03:00    50    31     14   237  (WSW)  23208   cloudy     rain
     04:00    50    32     10   260    (W)  31729   cloudy     rain
     05:00    50    31     14   244  (WSW)  21422   cloudy     rain
     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.
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