Date: Fri, 12 Feb 2010 10:37:05 -0000 (UTC)
Subject: 3.5m Night Log 20100211
From: "Gabrelle Saurage"
                       Apache Point Observatory
                       3.5m Telescope Night Log
                       Thursday, February 11, 2010
                                                       ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
 J.Pizagno       J.Pizagno              DIS            20:00  23:15
 L.Winter        L.Winter,B.Keeney      DIS            --:--  --:--
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 --------------------------------------------------------------------
 UW09/R    17:54   00:10   3.0   0    0    0   3.3   0    0    0
 CU08/R    00:10   06:41   5.7  0.8   0    0    0    0    0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
 Observing Specialist: G.Saurage
UT 23:46 First slew of the night. Moving away from Alt ~80 degrees, telescope slewed
almost down to 30 degrees then suddenly gave a Motion error too large and the Alt
axis let go (as if an E-stop was hit) and free slewed of its own accord up to zenith
and hit the Max position limit. I've never seen this happen mid-slew before. I
physically moved it off 90, init-ed axes (only the Alt axis disengaged) and tried
another slew. Got the Motion error again but since it was already up high it did not
slew up to Max position limit again. Init-ed axes again and this slew worked fine.
All others the rest of the evening were fine as well.
We had clouds and local radar returns at the beginning of the night and could not
open until 20:00. With the build up of snow onsite we had lower wind restrictions
(gusts  20 mph and 40 mph gusts with periods of
high humidity. The wind has moved snow drifts around the site to cover over the nice
clean sidewalks day crew spend yesterday clearing. Dome left pointed North as per
Bill's request.
                    ------- 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
--------------------------------------------------------------------------
 20:10 dis-slit    74( -480) 102  57  -4.9 -3.3 -3.8 -4.8 -4.4     1.77
 22:34 dis-slit   156( -540)  27  77  -6.0 -6.0 -5.8 -6.4 -6.2     1.51
             ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    26    16      2   283  (WNW)    264   cloudy     none
     17:00    26    15     22   345  (NNW)    231   cloudy     none
     18:00    24    14      9   309   (NW)    224   cloudy     none
     19:00    24    14      6   351    (N)    184   cloudy     none
     20:00    23    13     11   331  (NNW)    228 mstly clr    none
     21:00    22    15     17   345  (NNW)    232 mstly clr    none
     22:00    21    16     15     7    (N)    214 mstly clr    none
     23:00    21    15     27    10    (N)    339 mstly clr   humid
     00:00    21    13     20     1    (N)    296 mstly clr   humid
     01:00    20    15     22   350    (N)    341 mstly clr   humid
     02:00    20    12     21    13  (NNE)    634 mstly clr    none
     03:00    24     5     19    15  (NNE)    584 mstly clr    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: 1.7.0