Apache Point Observatory
                      3.5m Telescope Night Log
                      Saturday, February 28, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UV04  S.Majewski        J.Davidson,D.Demars,E.Breier

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UV04  DSSI           18:03   06:22   

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UV04/R      18:08  00:10    0    0    0    0   0.0  6.0   0    0
UV04/R      00:10  06:22    0    0    0    0   0.8  5.4   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: T.Sutherland

Opened the dome at 16:45 to start venting to some nonthreatening looking clouds.

Some thin clouds here and there throughout the night but nothing major. 

No telescope or instrument problems tonight. It was a nice quiet 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
--------------------------------------------------------------------------
 18:21 dssi   425( 1512) 205  69  12.4 12.6 12.6 12.4 12.2   692nm  0.70


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    54    12     11   322   (NW)    204  ptly cldy   none 
     17:00    53    12      8   358    (N)    201  ptly cldy   none 
     18:00    54     5      8   336  (NNW)    120  ptly cldy   none 
     19:00    54     5     10   356    (N)     58 mstly clr    none 
     20:00    50     8      5   355    (N)    142 mstly clr    none 
     21:00    50     8      5   336  (NNW)    117    clear     none 
     22:00    53    15     10   284  (WNW)    142 mstly clr    none 
     23:00    53    21      6   249  (WSW)    234 mstly clr    none 
     00:00    52    21      8   227   (SW)    302    clear     none 
     01:00    52    20      8   241  (WSW)    246    clear     none 
     02:00    53    23     11   265    (W)    271    clear     none 
     03:00    52    23      8   262    (W)    401    clear     none 
     04:00    51    22      4   258  (WSW)    247    clear     none 
     05:00    49    22      6   326   (NW)    280    clear     none 
     06:00    50    23      4   313   (NW)    277    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