Subject: 3.5m Night Log 20210430
From: mcmillan@apo.nmsu.edu
Date: Sat,  1 May 2021 12:28:33 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, April 30, 2021
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW03  T.Dorn-Wallenstein T.Dorn-Wallenstein
UW01  S.Hawley          M.Schutte
JH06  T.Marriage        M.Hilton
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW03  ECHELLE        20:11   21:46
UW01  ARCTIC         21:50   02:00
JH06  NICFPS         02:15   05:57
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW03/R      19:53  21:50    0   0.3   0    0   1.7  0.0   0    0
UW01/R      21:50  02:10    0    0    0    0   2.4  2.0   0    0
JH06/R      02:10  06:07    0    0    0    0   0.0  3.9   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
Heavy clouds before sunset cleared up during twilight, and the borderline humidity gradually dropped.  Initially the seeing was quite bad but became better after a few hours, and the night was extremely productive.  Telescope and instruments were trouble-free, including NICFPS.
                    ------- 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 ecamera    471( -406)   9  74   2.9  6.0  5.8  5.9  3.6   ND4  2.81
 22:09 arctic   582(  715) 112  38   3.7  3.5  4.0  3.6  3.8  Semrock  1.42
 02:24 NICFPS     375(  941) -33  60   3.7  2.5  3.5  3.1  3.3   Ks  0.91
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    45    28      4    81    (E)   1032   cloudy     none
     17:00    44    32      2    61  (ENE)    920   cloudy     none
     18:00    42    30      3    49   (NE)    835   cloudy     none
     19:00    41    31     10    75  (ENE)    859 mstly cldy   none
     20:00    37    32      9    66  (ENE)    940 mstly clr   humid
     21:00    38    32     22    73  (ENE)           clear    humid
     22:00    39    30     26    69  (ENE)    670    clear     none
     23:00    38    30     25    74  (ENE)    835    clear     none
     00:00    38    30     15    73  (ENE)    923    clear     none
     01:00    38    30     18    77  (ENE)    981    clear     none
     02:00    38    30     13    79    (E)    929    clear     none
     03:00    39    29      8    34   (NE)    262    clear     none
     04:00    40    28      1   313   (NW)    350    clear     none
     05:00    38    30      6   274    (W)    553    clear     none
     06:00    37    32      5   307   (NW)    733    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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