Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, June 26, 2026

PROG  PI ASTRONOMER      OBSERVER(S) 
--------------------------------------------------------------------
AP02  S.Merkowitz       R.McMillan            
UW01  P.Yoachim         Z.Xu,D.Meng,Z.Liu     
NM05  N.Chanover        N.Chanover            

                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP02  APOLLO         --:--   --:--   
UW01  KOSMOS         --:--   --:--
NM05  ECHELLE        --:--   --:--

   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP02/R      20:24  22:47    0   2.4   0    0   0.0  0.0   0    0
UW01/R      22:47  01:10    0   2.4   0    0   0.0  0.0   0    0
NM05/R      01:10  05:49   2.0  2.6   0    0   0.0  0.0   0    0

note: scheduled times listed include instrument change time

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

The rain started just before sunset, and recurred intermittently until about 2 am.  But the particle counts were also quite high, and the clouds never really went away aside from a few gaps while there were still other reasons to stay closed.

                    ------- 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
--------------------------------------------------------------------------


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

                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    73    41     16   274    (W)    909 mstly clr    none 
     17:00    76    42      9   261    (W)   1003  ptly cldy   none 
     18:00    74    41     16   255  (WSW)    974  ptly cldy   none 
     19:00    72    40     16   251  (WSW)   1051 mstly cldy   none 
     20:00    70    37     15   260    (W)    828   cloudy     rain 
     21:00    58    40     13   235   (SW)  16731   cloudy     rain 
     22:00    59    32     11    65  (ENE)  10011   cloudy   lt rain
     23:00    62    32     12   327  (NNW)   7929   cloudy     dust 
     00:00    58    31     22   225   (SW)   4014   cloudy   lt rain
     01:00    58    31     17   188    (S)  36580   cloudy     dust 
     02:00    57    28     13   197  (SSW)  10375   cloudy     dust 
     03:00    60    31     13   250  (WSW)   6063   cloudy     dust 
     04:00    59    29     13   229   (SW)   7068   cloudy     dust 


     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.

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