Subject: 3.5m Night Log 20240906
From: mcroom@apo.nmsu.edu
Date: Sat,  7 Sep 2024 10:21:04 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, September 06, 2024
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW02  P.Szkody          P.Szkody
NM03  M.Croom           M.Croom
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW02  KOSMOS         19:40   00:35
NM03  KOSMOS         03:15   03:45
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW02/R      19:29  01:10   0.6  0.2   0    0   3.4  1.5   0    0
NM03/O      01:10  06:34   4.9   0    0    0   0.5  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: M.Croom
Afternoon rain and nearby radar delayed opening a little bit. Following that, the weather conditions were fine until the humidity rose fairly quickly near the end of A Half causing us to close. The humidity finally dropped mid way through B Half with a good trend to trick me into reopening, but the trend reversed within 30 minutes forcing another closing. I finally gave up a bit after 4:00 as this left insufficient time for the faint targets.
Once underway, there were no issues with the telescope or KOSMOS.
                    ------- 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
--------------------------------------------------------------------------
 20:53 khigh   250( 1175)  24  52  10.8 12.1 12.2 11.8 10.9   -  1.36
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    56    47      1    79    (E)        mstly cldy   none
     17:00    56    47      1    85    (E)   1500 mstly cldy   none
     18:00    55    46      7    85    (E)         ptly cldy   none
     19:00    53    46     16    79    (E)        mstly clr    none
     20:00    52    46     23    69  (ENE)           clear     none
     21:00    52    44     25    59  (ENE)           clear     none
     22:00    51    44     26    75  (ENE)           clear     none
     23:00    51    44     26    73  (ENE)           clear     none
     00:00    50    43     22    58  (ENE)           clear    humid
     01:00    49    46     24    75  (ENE)           clear    humid
     02:00    50    46     18    75  (ENE)           clear    humid
     03:00    50    45     16    62  (ENE)           clear     none
     04:00    50    46     15    64  (ENE)           clear    humid
     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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