Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, March 02, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
GS04  G.Schaefer        J.Davidson,D.Demars,E.Breier
GS02  D.Gies            A.Chaturvedi          
AP02  S.Merkowitz       R.McMillan,T.Sutherland

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
GS04  DSSI           18:10   00:10   
GS02  ECHELLE        00:13   02:53
AP02  APOLLO         02:59   05:30

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
GS04/R      18:10  00:10    0    0    0    0   0.0  6.0   0    0
GS02/R      00:10  03:00    0    0    0   0.4   0.0  2.4   0    0
AP02/R      03:00  06:20    0    0    0    0   0.0  3.3   0    0

note: scheduled times listed include instrument change time

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

Powercycled dataq 3x at start of afternoon.

Opened at 16:30 to start venting. Had few clouds and great seeing all night.

There was a collimation failure after switching to echelle around midnight. Did a quick and dirty fix for homing secondary encoder A that Russet helped with. Secondary mirror homed this morning. 

Lunar eclipse happened tonight! Observed until the moon got too low in the sky. Got some interesting Apollo data, and it was also just really neat seeing the laser pointed at the red moon :)

                    ------- FAILURE LOG -------

              FAILURE MODE     TIME
PROG   INSTR     TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
GS02  echelle   T/H       00:13   00:37   Sec encoder A collimation failure

            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 18:26 dssi   425( 1530) -71  77  12.5 13.0 13.3 12.7 12.3   692nm  0.60
 00:40 ecamera    465(   57) 238  72  11.4 10.6 11.2 10.5 10.9   ND4  0.62
 03:01 APOLLO     485( 1820)  -6  46  10.1  9.5 10.2  9.3  9.5   --  0.90

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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
	
     16:00    62    14     14   228   (SW)    380 mstly clr    none 
     17:00    58    12     18   247  (WSW)    417 mstly clr    none 
     18:00    54    12     17   235   (SW)    295    clear     none 
     19:00    54    11     17   242  (WSW)    269    clear     none 
     20:00    54    12     10   263    (W)    324    clear     none 
     21:00    54    14     14   239  (WSW)    405    clear     none 
     22:00    53    14     11   263    (W)    342 mstly clr    none 
     23:00    52    14     12   267    (W)    254 mstly clr    none 
     00:00    52    12     14   266    (W)    245 mstly clr    none 
     01:00    52    12     15   266    (W)    290    clear     none 
     02:00    51    12     15   254  (WSW)    432    clear     none 
     03:00    50    12     14   263    (W)    313    clear     none 
     04:00    50    14     17   265    (W)    366    clear     none 
     05:00    50    13     17   265    (W)    322    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