Subject: 3.5m Night Log 20251010
From: mcmillan@apo.nmsu.edu
Date: Sat, 11 Oct 2025 11:12:14 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, October 10, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
WY01  C.Kobulnicky      N.Patten
UW05  C.Chandler        M.Frisell
AP02  S.Merkowitz       R.McMillan
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
WY01  ECHELLE        18:53   22:41
UW05  ARCTIC         --:--   --:--
AP02  APOLLO         --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
WY01/R      18:44  01:10    0   2.7   0    0   2.4  1.4   0    0
UW05/R      01:10  04:03    0   2.9   0    0   0.0  0.0   0    0
AP02/R      04:03  06:56    0   2.9   0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
Unsettled weather in the late afternoon improved starting at sunset, and we were able to use several hours on the sky until humidity crept too high.  Near midnight, the rain sensor went off, but it was triggered just by the humidity.  After 3 am, thicker clouds moved in and although the humidity dropped then, it was clear from satellite and radar that the bad weather was moving in.
                    ------- 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
--------------------------------------------------------------------------
 19:00 ecamera    559(  326) 170  76  11.5 14.3 14.0 13.8 12.2   ND2  1.03
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    57    45      6   162  (SSE)    652  ptly cldy   none
     17:00    56    44     14   154  (SSE)    662  ptly cldy   none
     18:00    55    43     12   129   (SE)    680  ptly cldy   none
     19:00    53    45     20   127   (SE)        mstly clr    none
     20:00    52    44     15   104  (ESE)           clear     none
     21:00    51    44     18   112  (ESE)           clear     none
     22:00    51    45     16   113  (ESE)        mstly clr    none
     23:00    51    46     21   128   (SE)        mstly clr   humid
     00:00    50    47     19   132   (SE)        mstly clr   humid
     01:00    50    47     17   132   (SE)        mstly clr   humid
     02:00    49    46     21   137   (SE)        mstly clr   humid
     03:00    50    47     16   158  (SSE)         ptly cldy  humid
     04:00    52    45     17   181    (S)          cloudy     none
     05:00    53    44     14   178    (S)          cloudy     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.
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