Subject: 3.5m Night Log 20240126
From: dembicky@apo.nmsu.edu
Date: Sat, 27 Jan 2024 10:38:44 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, January 26, 2024
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
EN01  B.Ketzeback       J.Dembicky
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
EN01  DIS            --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
EN01/W      17:39  06:53   0.8 12.4  0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: J.Dembicky
Snow on enclosure kept us closed tonight.
Russet took DIS contamination checks during the afternoon.
Echelle was around 330lbs at 18:00 when I filled during afternoon fills.
It was cloudy and humid until around 23:00, then the sky cleared but the humidity didn't drop below closure levels until around 02:30.
Echelle was at 333 lbs 03:15 when I did end of night fills.
I ran the snow program all night and turned off the roof heaters at around 20:00 when the temps were below -3C.
I parked the telescope SSW to hopefully get the sun to melt the snow off the enclosure during the day.  Looks like it may be sunny for most of the day.
                    ------- FAILURE LOG -------
              FAILURE MODE     TIME
PROG   INSTR     TI/SHU    START  FINISH  DESCRIPTION
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            ---------------- 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    28    27      1   292  (WNW)          cloudy    humid
     17:00    28    27     15    20  (NNE)         ptly cldy  humid
     18:00    27    25      3     8    (N)        mstly cldy  humid
     19:00    27    25     11    62  (ENE)        mstly cldy  humid
     20:00    26    24     20    57  (ENE)        mstly cldy  humid
     21:00    26    23     15    65  (ENE)        mstly cldy  humid
     22:00    25    22     11    55   (NE)        mstly cldy  humid
     23:00    26    20     14    32  (NNE)        mstly clr   humid
     00:00    26    21     11     2    (N)           clear    humid
     01:00    26    20     11     8    (N)           clear    humid
     02:00    26    19     15    43   (NE)           clear    humid
     03:00    26    16     24    43   (NE)           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.
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