Subject: 3.5m Night Log 20250328
From: ajt@apo.nmsu.edu
Date: Sat, 29 Mar 2025 13:47:12 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, March 28, 2025
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
UW14  B.Benda           B.Benda,S.Tuttle
UW06  C.Chandler        M.Frissell
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
UW14  ECHELLE        19:55   01:12
UW06  ARCTIC         01:16   06:06
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
UW14/R      19:29  01:10   0.4   0    0    0   5.3  0.0   0    0
UW06/R      01:10  06:46    0    0    0    0   5.6  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend
Agile failed at checkout; Russet did some further examination and it looks like minimum exposure times are much larger than previously.
We had to wait about half an hour for the dust to drop at sunset before opening. We had decent seeing but the clouds got really bad in B-half, especially towards the end of the night.
Cannot compute error on first tcc rot 0 mount command after inst change, but I re-initialized the axes and reslewed without problem.
Restored ARCTIC rotation to full +/-270 range, no problems with the ion pump.
                    ------- 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
--------------------------------------------------------------------------
 20:04 ecamera    601(  463) 170  68  10.4 12.0 12.1 11.7 10.9   ND3  0.94
 23:25 ecamera    383(   95) 285  71   9.4  9.0  9.6  9.0  9.2   ND4  1.02
 01:23 arctic     303( 1059)  19  65   7.7  7.6  8.3  7.5  7.6   CUVR  1.15
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    58    15     27   257  (WSW)   2642  ptly cldy   none
     17:00    56    10     20   266    (W)   3280  ptly cldy   none
     18:00    54    11     19   255  (WSW)   4050 mstly cldy   dust
     19:00    53    12     26   262    (W)   6214 mstly cldy   dust
     20:00    51    13     18   262    (W)   3202 mstly cldy   none
     21:00    50    14     18   267    (W)   2010    clear     none
     22:00    50    14     12   246  (WSW)   2821    clear     none
     23:00    49    13     16   258  (WSW)   2834    clear     none
     00:00    48    11     28   276    (W)   1984 mstly clr    none
     01:00    46     9     19   255  (WSW)   1710 mstly cldy   none
     02:00    46     9     16   280    (W)   1902 mstly cldy   none
     03:00    45    12     18   278    (W)   1455 mstly cldy   none
     04:00    43    13     15   278    (W)   1378 mstly cldy   none
     05:00    43    16     21   290  (WNW)   1527 mstly cldy   none
     06:00    42    20     11   272    (W)   1435 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