Subject: 3.5m Night Log 20210914
From: cgray@apo.nmsu.edu
Date: Wed, 15 Sep 2021 12:53:16 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, September 14, 2021
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
NM04  E.Nielsen         E.Nielsen
BY03  B.Proudfoot       B.Proudfoot
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
NM04  ECHELLE        19:19   01:00
BY03  ARCTIC         02:05   06:36
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
NM04/R      19:19  01:10    0    0    0    0   0.1  5.8   0    0
BY03/R      01:10  06:39   0.9   0    0    0   4.6  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: C.Gray
nicfps needed expose init during checkout
The evening started out clear with excellent seeing all night. There were some scattered clouds in the basin and I was watching one of them closely before switch over. Radar indicated that it was probably safe...but then virga hit and there was a little but of drizzle on the mirror. Particle counts were no high tonight. After the cloud passed we opened back up to clear skies. Another set of similar clouds that didn't initially look dangerous skirted us to the east. However, it did not get close enough to warrant closing.
                    ------- 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
--------------------------------------------------------------------------
 19:30 ecamera    458(  579) -40  45  18.4 20.4 19.8 20.3 19.2   ND4  0.95
 20:42 ecamera    357(  422) -29  23  17.5 18.8 19.0 18.2 18.2   ND1  1.40
 02:06 arctic   354( 1368) -47  60  16.7 16.2 16.6 16.3 16.3   sdss-r  0.82
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    71    40     12   215   (SW)   1557    clear     none
     17:00    72    36     12   218   (SW)   1474    clear     none
     18:00    70    34      6   257  (WSW)   1477    clear     none
     19:00    64    35      7   246  (WSW)   1353    clear     none
     20:00    65    30      5   228   (SW)   1404    clear     none
     21:00    64    32     11   160  (SSE)   1399 mstly clr    none
     22:00    63    34      9   165  (SSE)   1449 mstly clr    none
     23:00    63    34     14   180    (S)   1644 mstly clr    none
     00:00    63    32     11   174    (S)   1619  ptly cldy   none
     01:00    63    33      4   216   (SW)   1704 mstly cldy lt rain
     02:00    62    29      9   184    (S)   2138    clear     none
     03:00    62    33      5   187    (S)   1650    clear     none
     04:00    63    34      2   245  (WSW)   1249  ptly cldy   none
     05:00    60    34      8    10    (N)   1493  ptly cldy   none
     06:00    59    33     16    62  (ENE)   1346    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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