Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, February 27, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
UV01  D.Demars          D.Demars,J.Davidson,E.Breier
BY03  E.Hintz           G.Steed,S.Richmond    

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UV01  TSPEC          18:38   23:15   
UV01  EYEPIECE       23:20   00:05
BY03  TSPEC          00:16   06:10

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UV01/O      18:07  00:10    0    0    0    0   0.0  6.1   0    0
BY03/R      00:10  06:24    0    0    0    0   1.5  4.8   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend

Motion error in alt on first slew after opening (small upwards slew). 
Power cycled dataq twice tonight. 

Same weather pattern as yesterday; thin clouds in and out all night but subarcsecond seeing! Eyepiece viewing was pretty good despite the few clouds.

NA2 rotator zeroed this morning (-0.133)

                    ------- 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
--------------------------------------------------------------------------
 18:47 tcamera    419( 1369) -51  74  10.9 12.8 12.4 12.7 11.0   Ks  0.94
 19:59 tcamera    514( 1379) -77  61  10.9 10.9 11.3 10.8 10.7   Ks  0.97
 00:24 tcamera    503( 1299) 166  65  10.4  9.5 10.2  9.6  9.9   Ks  0.87

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    54     7     10   301  (WNW)     90 mstly clr    none 
     17:00    53     7      1   231   (SW)    112 mstly clr    none 
     18:00    52     9      8   332  (NNW)    112    clear     none 
     19:00    51     9      8   313   (NW)    150    clear     none 
     20:00    52    11     11   289  (WNW)    162 mstly clr    none 
     21:00    52    12     11   269    (W)    132 mstly clr    none 
     22:00    51    15     11   268    (W)    183 mstly clr    none 
     23:00    50    19     12   265    (W)    315 mstly clr    none 
     00:00    51    20     10   250  (WSW)    268 mstly clr    none 
     01:00    51    23      9   261    (W)    218 mstly clr    none 
     02:00    50    22      8   262    (W)    233    clear     none 
     03:00    50    22      7   307   (NW)    248    clear     none 
     04:00    44    21      7   350    (N)    253    clear     none 
     05:00    50    19     14   341  (NNW)    251 mstly clr    none 
     06:00    51    15      7    20  (NNE)    187 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