Subject: 3.5m Night Log 20210128
From: mcmillan@apo.nmsu.edu
Date: Fri, 29 Jan 2021 12:33:55 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Thursday, January 28, 2021
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
EN01  B.Ketzeback       R.McMillan
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
EN01  DIS            01:00   02:00
EN01  SHACK          02:05   03:00
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
EN01/O      17:41  06:51    0   6.3   0    0   0.0  6.9   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
I had the dome open at sunset, but I was never even able to focus due to clouds coming and going.  I stayed open for cooling purposes until semi-believable radar started coming near, then I closed.  For the remainder of first half, the clouds and nearby radar persisted.  I did some work reducing last night's pointing model.
After 1 am it looked safe to open again, and I got some other tasks in: another measurement of DIS slitviewer vs spectrograph focus, and then some Shack-Hartmann observations.  After an adjustment to the collimation, I checked pointing with the NA2 guider, but then the clouds started getting thicker and some more believable radar started getting closer, so it seemed like time to close for the night.
                    ------- 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
--------------------------------------------------------------------------
 01:06 dcamera    574(  536) 134  74   4.8  4.2  4.6  4.3  4.7   -  1.56
 01:17 dcamera    487(  453)  87  56   4.0  4.1  4.6  4.1  4.1   -  1.46
 01:41 dcamera    461(  419)  83  61   4.4  4.0  4.5  3.9  4.2   -  1.39
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    42     6     12   187    (S)        mstly clr    none
     17:00    43     6     12   219   (SW)         ptly cldy   none
     18:00    40    -1     10   216   (SW)        mstly cldy   none
     19:00    40    -1     11   217   (SW)        mstly cldy   none
     20:00    40    -1     12   215   (SW)        mstly cldy   none
     21:00    40    -1      9   265    (W)         ptly cldy   none
     22:00    41    -1     15   251  (WSW)        mstly cldy   none
     23:00    41    -4     13   259    (W)        mstly cldy   none
     00:00    42    -4     14   242  (WSW)        mstly cldy   none
     01:00    41    -2      9   256  (WSW)        mstly clr    none
     02:00    40     3     17   213  (SSW)        mstly clr    none
     03:00    41     1     25   214   (SW)         ptly cldy   none
     04:00    41     4     24   205  (SSW)         ptly cldy   none
     05:00    42     9     24   201  (SSW)         ptly cldy   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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