Subject: 3.5m Night Log 20240320
From: mcroom@apo.nmsu.edu
Date: Thu, 21 Mar 2024 11:12:30 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, March 20, 2024
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan
GS02  D.Gies            K.Shepard
CU04  Y.Notsu           Y.Notsu
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         19:40   20:22
GS02  ECHELLE        --:--   --:--
CU04  ARCTIC         03:36   04:12
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/R      19:24  20:24    0  0.3    0    0   0.0  0.7   0    0
GS02/R      20:24  01:10    0  4.8    0    0   0.0  0.0   0    0
CU04/R      01:10  06:56   1.4 3.8    0    0   0.0  0.6   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: M.Croom
The sky was mostly cloudy at dusk, but the clouds presented sufficient gaps to allow APOLLO to collect data. However, the sky clouded up again, radar was nearby and dust and humidity rose which forced us to close right as we were switching over to the echelle program GS02. Conditions did not improve sufficiently to reopen until well into the final program (CU04) time slot. Cloudy conditions prevailed but longer exposures helped to compensate the attenuation. Data was collected for about 40 minutes before conditions deteriorated with radar nearby. We closed for the final time at 04:15 and gave up 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
--------------------------------------------------------------------------
 18:46 APOLLO     300( 1593)  81  53   1.7  4.5  4.4  4.7  2.5   530  1.40
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    40    20     13   267    (W)    793   cloudy     none
     17:00    39    24     10   253  (WSW)    865   cloudy     none
     18:00    39    23     14   224   (SW)    807   cloudy     none
     19:00    38    23     16   222   (SW)    825 mstly cldy   none
     20:00    35    23     21   204  (SSW)   1081 mstly cldy   none
     21:00    33    29     15   200  (SSW)        mstly clr   humid
     22:00    32    30      7   200  (SSW)           clear    humid
     23:00    31    30      7   189    (S)        mstly clr   humid
     00:00    31    30     10   242  (WSW)        mstly clr   humid
     01:00    32    28     11   217   (SW)        mstly clr   humid
     02:00    31    29      3   209  (SSW)         ptly cldy  humid
     03:00    32    26      9   282  (WNW)        mstly cldy   none
     04:00    32    25      7   336  (NNW)    724   cloudy     none
     05:00    32    24      1   336  (NNW)    684   cloudy     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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