Subject: 3.5m Night Log 20250504
From: dembicky@apo.nmsu.edu
Date: Mon,  5 May 2025 11:21:21 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Sunday, May 04, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
CU03  Z.Berta-Thompson  Z.Berta-Thompson
NM09  A.Smith           A.Peck, A.Abbas
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU03  KOSMOS         --:--   --:--
NM09  ECHELLE        --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU03/R      19:56  01:10    0   5.2   0    0   0.0  0.0   0    0
NM09/R      01:10  06:03   3.3  1.6   0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: J.Dembicky
the 3.5m Air on the weather page seems to be stuck.  I used the Optidew and 2.5m humidity.
Clouds, with nearby radar returns kept us closed at the start of the night, then humidity went up, when the clouds cleared the dust went over the closure limit.  Humidity did drop but dust was still over the limit after about 2AM until the end of the night.  We gave up at 05:00.
                    ------- 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
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               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    50    33      8   177    (S)   2043   cloudy     none
     17:00    47    32     21   127   (SE)   1878   cloudy     none
     18:00    49    32     15   158  (SSE)   1716   cloudy     none
     19:00    48    32     17   142   (SE)   1971  ptly cldy   none
     20:00    48    32     18   146   (SE)   2143  ptly cldy   none
     21:00    44    32     18   127   (SE)   1997 mstly cldy   none
     22:00    43    32     15   114  (ESE)   2495   cloudy     none
     23:00    43    32     16   116  (ESE)   2995   cloudy    humid
     00:00    43    32     15   113  (ESE)   5680  ptly cldy  humid
     01:00    42    31     15   126   (SE)   6951 mstly clr   humid
     02:00    40    32     10   174    (S)           clear     dust
     03:00    39    28     11   209  (SSW)   5031    clear     dust
     04:00    42    28     13   184    (S)   4522    clear     dust
     05:00    40    31     15   204  (SSW)           clear     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.
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