Date: Mon, 12 Apr 2010 12:11:29 -0000 (UTC)
Subject: 3.5m Night Log 20100411
From: jwhueh@apo.nmsu.edu
                       Apache Point Observatory
                       3.5m Telescope Night Log
                       Sunday, April 11, 2010
                                                       ACTUAL
ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
A. Kowalski     A. Kowalski             DIS          19:34    01:10
X. Liu          X. Liu                  DIS          01:10    06:00
  INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
--------------------------------------------------------------------
UW01/R    19:39   01:10    0    0    0    0   5.5   0    0    0
PU02/R    01:10   06:29    0    0    0    0   4.1  1.2   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist:    J. Huehnerhoff
Clouds at the start of evening, disipating after twilight.
At 03:11MT after a focus run, with the telescope in tracking, I noticed an
oscillation of about 2" in the azimuth current telemetry.  When I turned
on the intercom I could hear the drives humming.  It occurred again at
03:14 but when it occurred this time it was changed from a fast
oscillation to a slow and back to a fast.  This occurred at and alt/az of
53/-76.5.  Stopped shortly after.  No noticable affect on imaging, but
seeing was bad at the time.
The same oscillation occurred at the same alt/az at 0500MT.  I checked the
az drive surface and all adjacent areas to make sure nothing was binding,
nothing was found.  After restarting drives the oscillation came back,
while it was oscillating I physically checked the az drives for any
obvious problems and found nothing.  While oscillating was occurring the
whole az ring and mount was shaking noticeably.  The observer was not able
to observer their target at this position due to this problem.
Could not find a PR with similar problem so PR1118 was submitted.
                    ------- 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
--------------------------------------------------------------------------
 20:03 dis-slit    85(  351) 121  61   9.6 13.4 11.1 11.8 13.2   clear  1.37
 01:15 dis-slit   107(   73) -78  55   7.7  7.3  7.5  6.6  7.1   clear  1.11
 03:09 dis-slit   134(   84) -74  55   7.8  7.0  7.3  6.3  7.0   clear  1.54
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    59    19      9   189    (S)    784  ptly cldy   none
     17:00    63    21     12   258  (WSW)    787  ptly cldy   none
     18:00    56    18      3   238  (WSW)    821 mstly clr    none
     19:00    54    20      7   213  (SSW)    752 mstly clr    none
     20:00    49    18      5   250  (WSW)    873    clear     none
     21:00    50    18      5   262    (W)    950    clear     none
     22:00    50    20      2   242  (WSW)   1028    clear     none
     23:00    48    25     12   132   (SE)   1023    clear     none
     00:00    46    32      8   125   (SE)    977    clear     none
     01:00    46    34     18   126   (SE)    951    clear     none
     02:00    46    32     14   120  (ESE)    975    clear     none
     03:00    45    32     15   127   (SE)    856    clear     none
     04:00    47    30     15   130   (SE)    910    clear     none
     05:00    46    30     14   140   (SE)    829    clear     none
     06:00    46    30     15   127   (SE)    881    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: 2.11.1
    Current TUI version: 1.7.1