Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, February 23, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan            
BY05  E.Hintz           S.Richmond, M.Gee     
UW04  B.Choi            B.Choi                

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         18:04   19:05   
BY05  TripleSpec     19:07   11:55
UW04  ECHELLE        00:00   05:59

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/R      18:04  19:04    0    0    0    0   0.0  1.0   0    0
BY05/R      19:04  00:10    0    0    0    0   0.0  5.1   0    0
UW04/R      00:10  06:28    0    0    0    0   5.4  0.9   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot, R.McMillan

Clear throughout APOLLO. Scattered clouds throughout the night with no downtime. BY05 finished slightly early and donated remaining time to UW04.

We took some test biases and darks of KOSMOS and also tested some simple failure modes and recovery procedures. We could not train on the most complicated recovery procedure (torrent server restart) because of a malfunctioning KVM in the computer room. PR submitted for this issue.

Restarted Dataq at start of shift.

                    ------- 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
--------------------------------------------------------------------------
 18:08 APOLLO     375( 1642)  78  75   4.2  8.4  7.1  8.5  4.9   530  1.10
 19:34 tcamera    383( 1054) -141  46   4.8  6.6  6.3  6.0  4.8   Ks  0.92
 00:03 ecamera    393( -265) 109  37   5.9  4.8  5.5  4.5  5.7   clear  1.91


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    44    10      6   262    (W)   1213 mstly clr    none 
     17:00    45    11      1   213  (SSW)   1223 mstly clr    none 
     18:00    40    11      1   228   (SW)   1258 mstly clr    none 
     19:00    43     2      3   251  (WSW)    752 mstly clr    none 
     20:00    40     9      2   235   (SW)   1309  ptly cldy   none 
     21:00    43    -3      3    42   (NE)    742  ptly cldy   none 
     22:00    44    -5      5   339  (NNW)    329    clear     none 
     23:00    44    -6      2   232   (SW)    369    clear     none 
     00:00    43    -7      2   210  (SSW)    292 mstly clr    none 
     01:00    42    -8      5   214   (SW)    322 mstly clr    none 
     02:00    40     5      7   237  (WSW)   1358 mstly clr    none 
     03:00    41     6      4   266    (W)   1171 mstly clr    none 
     04:00    43     3     13   315   (NW)    799 mstly clr    none 
     05:00    45    -1     14   302  (WNW)    581 mstly clr    none 
     06:00    45     5     16   300  (WNW)    806 mstly clr    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