Subject: 3.5m Night Log 20210925
From: ajt@apo.nmsu.edu
Date: Sun, 26 Sep 2021 12:45:00 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Saturday, September 25, 2021
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UV04  M.Skrutskie       O.Fox
WY01  M.Brotherton      A.Cavanaugh
AP01  S.Merkowitz       R.McMillan
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UV04  TSPEC          --:--   --:--
WY01  TSPEC          03:43   05:40
AP01  APOLLO         --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UV04/R      19:04  01:10   2.6  3.5   0    0   0.0  0.0   0    0
WY01/R      01:10  05:46    0   2.6   0    0   0.0  2.0   0    0
AP01/R      05:46  06:46    0   1.0   0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend
Due to radar returns, heavy clouds, and a small amount of light rain we did not open for A-half or the start of B-half. The western sky started to clear a little after 03:00, and we opened at 03:43.
Closed the dome at 05:40 between WY01 and AP01 as humidity reached the too-high threshold.
Motion error at 05:48 at alt=57 while slewing upwards with the dome closed, right after a large fiducial error (0.046535). When I went upstairs I did notice (and wipe off) what was probably some moth guts on the drive, so that could also be related.
Did not reopen due to high humidity and fog.
                    ------- 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
--------------------------------------------------------------------------
 03:55 tcamera    334( 1172) 261  65   9.4  9.4  9.9  9.5  9.2   Ks  1.02
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    56    31     13   123  (ESE)   1350   cloudy     none
     17:00    54    31     12   116  (ESE)   1496   cloudy     none
     18:00    53    31     14    87    (E)   1090   cloudy     none
     19:00    52    31     19    75  (ENE)   1120   cloudy     none
     20:00    51    31     17    84    (E)   1275   cloudy   lt rain
     21:00    50    30     13    89    (E)   1288   cloudy     none
     22:00    53    22     16   133   (SE)    604   cloudy     none
     23:00    51    26     22   141   (SE)    960   cloudy     none
     00:00    51    27     22   134   (SE)    921   cloudy     none
     01:00    51    30     18   147  (SSE)   1091   cloudy     none
     02:00    50    31     21   156  (SSE)    947   cloudy     none
     03:00    48    31     20   162  (SSE)    560 mstly cldy   none
     04:00    50    31     16   167  (SSE)    455  ptly cldy  humid
     05:00    49    30     20   184    (S)    307 mstly clr    fog
     06:00    47    31     13   180    (S)        mstly clr    fog
     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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