Apache Point Observatory
                      3.5m Telescope Night Log
                      Tuesday, March 24, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
CU01  Z.Berta-Thompson  Class                 
UW02  P.Yoachim         Z.Xu,Z.Liu,D.Meng     
UW04  B.Choi            B.Choi                

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
CU01  Eyepiece       19:40   21:00
CU01  KOSMOS         21:15   23:22
CU01  KOSMOS         00:00   01:09   
UW02  KOSMOS         01:11   03:37
UW04  ECHELLE        03:41   06:25

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
CU01/R      19:26  01:10    0  0.7    0    0   0.0  5.0   0    0
UW02/R      01:10  03:40    0    0    0    0   1.5  1.0   0    0
UW04/R      03:40  06:52    0    0    0    0   3.2  0.0   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: H.Abbot,A.Townsend

Full cloud coverage but thin enough to observe through most of A half. Sky cleared up mostly for B half. 

Telescope performed well throughout the 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
--------------------------------------------------------------------------
 21:12 kosmos   448( 1247) -16  60  14.9 14.9 15.1 14.5 14.6   --  0.82
 01:26 kosmos   448( 1224) 304  42  15.1 14.1 14.8 14.0 14.5   --  1.26
 03:48 ecamera    458(  201)  88  60  15.8 13.7 14.4 13.6 14.4   Clear  1.15



     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