Apache Point Observatory
                      3.5m Telescope Night Log
                      Thursday, April 16, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
BY04  E.Hintz           S.Felvus-Richmond,G.Steed
BY01  S.Turner          S.Turner              

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
BY04  TSPEC          19:53   22:35   
BY01  NICFPS         22:50   02:35
BY01  NICFPS	     03:34   05:40

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
BY04/R      19:43  22:43    0    0    0    0   3.0  0.0   0    0
BY01/R      22:43  06:23  1.0    0    0    0   6.6  0.1   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot

BY01 had late rising targets so donated time early in the night to BY04 (which was not originally scheduled to observe tonight).

Mostly clear through BY04's time, but clouds kept rolling in through BY01. Persevered through the clouds since there was no risk of rain, up until 0235. Sky cleared up again at 0330 and observed through the rest of the night.

No telescope issues to report. NICFPS is spitting out an "UNPARSEDTEXT" warning on every exposure, but it didn't seem to be affecting anything in the exposures.

                    ------- 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
--------------------------------------------------------------------------
 20:00 tcamera    471( 1344) -39  58   9.9 11.1 11.4 11.0  9.9   Ks  1.77
 22:58 NICFPS     556( 1480)  73  43   8.6  8.7  9.4  8.5  8.6   MK-J  0.91
 01:31 NICFPS     549( 1419)  18  67   8.5  8.0  8.6  8.1  8.2   MK-J  1.60
 03:41 NICFPS     547( 1397) -54  59   7.5  7.4  7.9  7.5  7.3   MK-J  1.30

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    56    17     32   231   (SW)   1561 mstly clr    none 
     17:00    58    20     24   211  (SSW)   1248 mstly clr    none 
     18:00    54    17     25   222   (SW)   1369    clear     none 
     19:00    53    17     17   221   (SW)   1325    clear     none 
     20:00    50    16     20   221   (SW)   1256    clear     none 
     21:00    50    15     18   211  (SSW)   1702 mstly clr    none 
     22:00    50    16     13   229   (SW)   1817  ptly cldy   none 
     23:00    48    12     10   263    (W)   1807  ptly cldy   none 
     00:00    47     9     13   248  (WSW)   1234  ptly cldy   none 
     01:00    47     6     17   250  (WSW)   1066 mstly cldy   none 
     02:00    47     6     17   267    (W)   1098   cloudy     none 
     03:00    46     9     14   264    (W)    803   cloudy     none 
     04:00    45    12     14   262    (W)    694  ptly cldy   none 
     05:00    45    16     13   256  (WSW)    684 mstly clr    none 
     06:00    44    20     17   258  (WSW)    680   cloudy     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