Subject: 3.5m Night Log 20250226
From: mcroom@apo.nmsu.edu
Date: Thu, 27 Feb 2025 11:31:32 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Wednesday, February 26, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW11  F.Chabour         F.Chabour,J.Davenport
NM04  M.Croom           M.Croom
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW11  KOSMOS         --:--   --:--
NM04  KOSMOS         --:--   --:--
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW11/R      18:07  00:10   6.1   0    0    0   0.0  0.0   0    0
NM04/O      00:10  06:25   6.2   0    0    0   0.0  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: M.Croom
Support from all of the ObsSpecs during our monthly meeting held concurrently, as corrective actions to the recurring disperser wheel error on KOSMOS were reviewed.
Weather conditions kept us closed all night: radar and dust during A Half, and radar, winds and humidity during B Half. Gave up at 4:30 as that left insufficient time for science.
Following several (~4) successful disperser moves earlier in the night, the KOSMOS disperser wheel error occurred twice, once while changing from blue to red and again going red to blue. KOSMOS was upright (rot=0) both times, and the air temperature was near 0C. Manually moving the wheel resolved the issue.
No telescope issues.
                    ------- 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    53     7      8   260    (W)    835   cloudy     none
     17:00    50     6      9   234   (SW)    756   cloudy     none
     18:00    42    12     11    90    (E)   1423   cloudy     none
     19:00    38    14     14    78  (ENE)   1815  ptly cldy   none
     20:00    37    15     16    87    (E)   2510  ptly cldy   none
     21:00    37    16     20    80    (E)   3388  ptly cldy   dust
     22:00    34    17     22    76  (ENE)   2717 mstly clr    none
     23:00    32    18     22    73  (ENE)   2145  ptly cldy   none
     00:00    31    18     18    74  (ENE)   1546 mstly clr    none
     01:00    27    18     19    77  (ENE)   1412 mstly clr    none
     02:00    25    19     34    67  (ENE)        mstly clr    none
     03:00    24    18     42    72  (ENE)           clear    humid
     04:00    24    15     29    73  (ENE)         ptly 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.
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