Subject: 3.5m Night Log 20190527
From: mcmillan@apo.nmsu.edu
Date: Tue, 28 May 2019 11:54:58 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, May 27, 2019
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
E.Dahl            E.Dahl                NAIC           20:17   22:40
E.Dahl            E.Dahl                NAIC           23:25   05:30
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 ----------------------------------------------------------------
NM01/R     20:12   05:49   0.8   0    0    0   5.8  3.1   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
High winds and high dust during late afternoon subsided quickly and we were able to open at the start of the night to get the visiting instrument focused and aligned.  Later, when Jupiter was rising, a dust spike got just into the closure range.  I shut the dome for a while and ran the press fans to bring down the inside dust, and once we got on sky again Jupiter was higher with tolerable seeing.
At 01:02:10 MDT, a power flicker caused UPSes to complain and the azimuth axis stopped tracking although the other axes were all right.  A simple init allowed us to recover within two minutes and the data taking was not badly affected, but I was a little surprised that such a brief flicker caused a problem.
The night was mostly clear but some of the time, clouds over the basin would impinge on the western sky and then disappear before moving east, in a reversal of the usual orographic pattern.  By the end of the night the setting targets were sometimes affected by these western clouds, but never badly enough to stop observing.
                    ------- FAILURE LOG -------
PROG   INST   FAILURE MODE     TIME
    (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 20:25 naic   800( 1869)  99  40  11.7 13.8 13.7 13.4 12.0   550  1.44
 00:04 naic   575( 1408)  31  28   8.1  8.9  9.7  8.6  8.3   550  1.5
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    62    17     40   218   (SW)   7723    clear     none
     17:00    65    19     21   202  (SSW)   7803    clear     none
     18:00    62    17     31   249  (WSW)   9468    clear     none
     19:00    59    15     33   244  (WSW)   6461    clear     none
     20:00    55    14     26   252  (WSW)   2706    clear     none
     21:00    52    18     19   260    (W)   2157 mstly clr    none
     22:00    50    20     15   266    (W)   2645 mstly clr    none
     23:00    48    19     22   289  (WNW)   4249    clear     none
     00:00    47    18     12   274    (W)   2472    clear     none
     01:00    46    18     17   275    (W)   1012    clear     none
     02:00    46    21     20   265    (W)    579    clear     none
     03:00    44    22     19   265    (W)    425 mstly clr    none
     04:00    42    21     19   275    (W)    460 mstly clr    none
     05:00    41    22     17   261    (W)    491    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.
                          TELESCOPE STATUS
    Telescope drives operational. Current TCC version: 1.2.4
    Current TUI version: 2.6.0