Subject: 3.5m Night Log 20210517
From: mcmillan@apo.nmsu.edu
Date: Tue, 18 May 2021 11:29:51 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, May 17, 2021
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
OU06  K.Leighly         J.Choi,C.DeFrancesco,
                        D.Terndrup,K.Leighly
                         ACTUAL
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
OU06  TSPEC          20:10   05:10
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
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OU06/R      20:06  05:52    0   0.5   0    0   4.6  4.7   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: R.McMillan
I had multiple problems with altitude motion during checkout, including a case where it started humming after nearly a minute holding at 35 deg, a case where it started humming the moment I did axis init (also 35 deg), and a case where it threw a motion error at the very beginning of a slew after I had moved it by hand down to 18 deg.  I thought this would turn into a serious problem for the evening, but once the night started to cool I only had to stop tracking once due to oscillations, and even then we were able to return to the field by approaching from the other direction.  I did encourage the observers to stay on eastern targets initially, but later targets were okay after crossing the meridian.
Clouds during first half interrupted data-taking for a little while although I kept the dome open, but mostly the observers were able to keep going on brighter targets.  During second half the sky cleared and they were able to observe some fainter targets as well.
                    ------- FAILURE LOG -------
              FAILURE MODE     TIME
PROG   INSTR     TI/SHU    START  FINISH  DESCRIPTION
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            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 20:33 tcamera    428( 1148)  84  36   9.9 11.6 11.9 11.4  9.9   Ks  1.01
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    58    14     26   270    (W)   1015    clear     none
     17:00    58    13     25   215   (SW)   1223    clear     none
     18:00    55     9     17   259    (W)   1012    clear     none
     19:00    54     9     19   266    (W)   1672 mstly clr    none
     20:00    51     6     17   260    (W)   1646 mstly clr    none
     21:00    49     9     14   267    (W)   1471  ptly cldy   none
     22:00    48    11     15   299  (WNW)   2125  ptly cldy   none
     23:00    48    11     17   282  (WNW)   1802  ptly cldy   none
     00:00    47    11     17   273    (W)   1467 mstly clr    none
     01:00    45    13     10   306   (NW)   1375    clear     none
     02:00    45    17     12   350    (N)   1353    clear     none
     03:00    45    20     11   306   (NW)           clear     none
     04:00    44    20      8   332  (NNW)           clear     none
     05:00    42    21      2    20  (NNE)           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 SOFTWARE  ----------
Current TCC version: 1.4.2
Current HUB version: v20171231_01
Current TUI version: 2.6.0