Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, April 22, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
NM06  W.Roberson        E.Nielsen,W.Roberson  
NM02  K.Sanderson       K.Sanderson           

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
NM06  ECHELLE        20:04   01:04   
NM02  KOSMOS         01:09   03:10

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
NM06/R      19:47  01:10    0    0    0    0   0.0  5.4   0    0
NM02/R      01:10  06:16   3.1   0    0    0   1.3  0.7   0    0

note: scheduled times listed include instrument change time

              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan

Before sunset, winds were borderline and we had some brief dust spikes, but by sunset I felt comfortable opening.  We had annoying high clouds the entire night, contrary to forecast.  They were thick in the middle of the evening, thinned out toward midnight, then thickened again a few hours later.  The second half observer was unable to get anything useful after 3:10, then gave up when there wasn't enough time to observe one target before twilight started.

                    ------- 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
--------------------------------------------------------------------------
 20:10 ecamera    616(  323)  80  55  11.2 12.8 12.9 12.4 11.2   ND3  1.23
 01:23 kosmos   525( 1057) -28  57   9.4  9.1  9.8  9.1  9.3   -  1.12


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    58    18     21   270    (W)   1871  ptly cldy   none 
     17:00    59    14     25   270    (W)   2267  ptly cldy   none 
     18:00    57    14     30   266    (W)   2362 mstly clr    none 
     19:00    55    13     24   259    (W)   2590 mstly clr    none 
     20:00    53    14     27   253  (WSW)   1914  ptly cldy   none 
     21:00    52    14     25   269    (W)   1433 mstly cldy   none 
     22:00    51    16     16   262    (W)   1482 mstly cldy   none 
     23:00    50    12     11   269    (W)   1476  ptly cldy   none 
     00:00    50    11     19   270    (W)   1520  ptly cldy   none 
     01:00    49    11     10   271    (W)   1543  ptly cldy   none 
     02:00    49    13     15   289  (WNW)   1840 mstly cldy   none 
     03:00    48    13     15   290  (WNW)   2033 mstly cldy   none 
     04:00    47    15     18   296  (WNW)   2083 mstly cldy   none 
     05:00    46    18     22   307   (NW)   2411 mstly cldy   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