Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, March 16, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
NM04  M.Cowles          M.Cowles,J.Burchett,A.Menchaca
GS01  M.Crenshaw        M.Crenshaw,Class      

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
NM04  ARCTIC         19:45   00:53   
GS01  KOSMOS         02:20   06:19

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
NM04/R      19:20  01:10    0.4    0    0    0   5.4  0.0   0    0
GS01/R      01:10  07:02    1.2    0    0    0   4.0  0.7   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: T.Sutherland,A.Townsend

Echelle is running new icc. Not echelle checkout image or afternoon iol because Gordon was running a script. I think morning iol is on the new echelle icc. 

Had to restart arctic filter wheel at start of A-half.

Dust high at start of night, it calmed down enough to open after sunset. Dust rose over the closure limit just as we were about to get on sky for GS01, and I had to close. Opened at 02:15 after dust came down enough to do so. 

                    ------- 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
--------------------------------------------------------------------------
 19:52 arctic   646( 1120)  70  27   4.0  5.1  4.9  5.2  3.9   SDSS_i  1.84
 21:36 arctic   516(  906)  47  46   5.0  3.8  4.1  3.8  4.4   SDSS_u  1.91
 02:31 khigh   566(  757) 208  73   4.7  2.1  3.6  3.4  4.4   --  0.98

               ------------- WEATHER LOG ----------------

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    41    12      5   326   (NW)   2247  ptly cldy   dust 
     17:00    39    12     20   326   (NW)   5978  ptly cldy   dust 
     18:00    40    13      6   336  (NNW)   5595  ptly cldy   dust 
     19:00    39    13      2   266    (W)   4013 mstly clr    dust 
     20:00    39    13      8   347  (NNW)   2669    clear     none 
     21:00    39    13     12    11    (N)   2347    clear     none 
     22:00    41    14     14    16  (NNE)   1384    clear     none 
     23:00    40    14     14     6    (N)   1262 mstly clr    none 
     00:00    38    12      5   353    (N)   2449 mstly clr    none 
     01:00    38    13     11   334  (NNW)   3846    clear     dust 
     02:00    40    14      7    15  (NNE)   3340    clear     none 
     03:00    41    16     11     3    (N)   1754    clear     none 
     04:00    41    15     10     2    (N)   3002    clear     none 
     05:00    40    16     11   358    (N)   2191    clear     none 
     06:00    40    17      7   349    (N)   1368    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.

              ----------  TELESCOPE SOFTWARE  ----------

Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 3.1.8