Subject: 3.5m Night Log 20250529
From: mcroom@apo.nmsu.edu
Date: Fri, 30 May 2025 11:58:36 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Thursday, May 29, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
AP01  S.Merkowitz       R.McMillan
CU05  Z.Berta-Thompson  Z.Berta-Thompson
CU05  Z.Berta-Thompson  Z.Berta-Thompson
UW03  B.Benda           B.Benda
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
AP01  APOLLO         20:14   21:08
CU05  KOSMOS         21:20   01:10
CU05  KOSMOS         01:10   01:34
UW03  ECHELLE        04:23   05:30
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
AP01/O      20:14  21:14    0    0    0  1.0   0.0  0.0   0    0
CU05/R      21:14  02:30   0.9   0    0    0   2.2  2.2   0    0
UW03/R      02:30  05:48   2.2   0    0    0   1.1  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: M.Croom
Support from Russet (on site)
Although we were on sky with APOLLO, there were no observations, just equipment checks and adjustments.
Humidity reached limits during the beginning of B Half causing us to close for the remainer of CU05's time and into UW03's time. Humidity dropped but dust levels were elevated; we finally dropped below 70% and 3000 counts to open for the last hour.
No telescope issues or issues with KOSMOS or Echelle.
                    ------- 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
--------------------------------------------------------------------------
 20:35 APOLLO     350( 2115) -104  30  12.9 14.1 14.5 13.8 13.4   530  1.85
 21:40 kosmos   250(  -45) -51  80   7.4  8.8 10.0  8.8  8.7   -  1.69
 04:32 ecamera    463(  195) 235  46  12.5  9.0 10.1  8.8 10.4   ND4  1.68
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    58    41     11    82    (E)   3169   cloudy   lt rain
     17:00    56    44     26    73  (ENE)   3423   cloudy     none
     18:00    61    40     13    79    (E)   2722  ptly cldy   none
     19:00    58    40     16    76  (ENE)   2845  ptly cldy   none
     20:00    56    41     13    80    (E)   2861  ptly cldy   none
     21:00    56    38      8   108  (ESE)   2845  ptly cldy   none
     22:00    54    38     11    87    (E)   2746  ptly cldy   none
     23:00    53    38     18    71  (ENE)   2313  ptly cldy   none
     00:00    52    38     24    74  (ENE)   2283 mstly clr    none
     01:00    49    27     18    80    (E)   2344 mstly clr    none
     02:00    45    32     22    74  (ENE)   2763 mstly clr   humid
     03:00    45    32     13    84    (E)   3078 mstly clr   humid
     04:00    47    32      6   177    (S)   3130    clear    humid
     05:00    55    32     15   180    (S)   2736    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.
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