Subject: 3.5m Night Log 20251003
From: tmcquaid@apo.nmsu.edu
Date: Sat,  4 Oct 2025 13:11:05 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, October 03, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
BY05  E.Hintz           S.Call,G.Steed,M.Gee
AP01  S.Merkowitz       R.McMillan,T.Sutherland
CU02  Y.Notsu           Y.Notsu
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
BY05  TripleSpec     19:03   23:08
AP01  APOLLO         23:11   00:56
CU02  ARCTIC         01:14   06:46
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
BY05/R      18:53  23:10    0    0    0    0   0.0  4.3   0    0
AP01/R      23:10  01:10    0    0    0    0   0.0  2.0   0    0
CU02/R      01:10  06:51    0    0    0    0   2.7  3.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: T.McQuaid,R.McMillan
Dome was opened before sunset for cooling, then closed for cals then opened soon after sunset.
Very clear night with mostly good seeing. Wind did pick up around midnight but didn't go up to the limit.
                    ------- 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
--------------------------------------------------------------------------
 19:11 tcamera    348( 1407) 254  45  12.9 14.8 14.9 14.7 13.2   Ks  1.07
 23:15 APOLLO     375( 1792) -24  38  11.3 11.1 11.7 11.0 11.2   530  1.20
 01:22 arctic   421( 1087) 237  60  10.2  9.9 10.6  9.9  9.9   4170  1.11
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    62    34     10   153  (SSE)    558    clear     none
     17:00    59    33     18   139   (SE)    551    clear     none
     18:00    58    34     18   153  (SSE)    560    clear     none
     19:00    55    35     12   161  (SSE)    640    clear     none
     20:00    55    36     14   162  (SSE)    584    clear     none
     21:00    53    36     18   158  (SSE)    573    clear     none
     22:00    53    37     22   157  (SSE)    570    clear     none
     23:00    53    37     25   145   (SE)    593    clear     none
     00:00    52    38     27   147  (SSE)    694    clear     none
     01:00    50    38     24   146   (SE)    694    clear     none
     02:00    50    38     18   148  (SSE)    706    clear     none
     03:00    52    36     20   171    (S)    546    clear     none
     04:00    51    36     24   181    (S)    567    clear     none
     05:00    50    36     18   154  (SSE)    621    clear     none
     06:00    49    36     15   159  (SSE)    611    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.
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