From:
Subject: 3.5m Night Log 20090222
Date: Mon, 23 Feb 2009 13:19:15 +0000 (UTC)
                        Apache Point Observatory
                        3.5m Telescope Night Log
                        Sunday, February 22, 2009
                                                         ACTUAL
 ASTRONOMER      OBSERVER(S)              INSTRUMENT   START  FINISH
-------------------------------------------------------------------
 T.Thuan         T.Thuan,Y.Izotov         DIS          18:45  00:10
 J.Dalcanton     S.Courteau               DIS          00:10  06:10
   INST     SCHED(TWILIGHT) WEATH     EQUIP      OBS     DAY  NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B   USE   D    B
----------------------------------------------------------------------
 UV01/R     18:49  00:10    0    0    0    0   5.3   0    0    0    0
 UW05/R     00:10  05:44    0    0    0    0   5.6   0    0    0    0
  note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
Observing Specialists: R.McMillan
We had thin clouds for most of first half, medium clouds beginning of
second half, then clearing by dawn.  Seeing was good to moderate.
Triplespec showed the all-zeroes problem at checkout, which I
corrected, then it showed up again when I did a random check a few
hours later.  In the interim, I filled the instrument but didn't move
it.
The telescope telemetry showed some rather perplexing variations in
altitude motor current during normal tracking (mostly in the east,
south, and north).  This might be related to the increased stiffness
we've noticed when moving the telescope by hand.  It didn't appear to
have any particular effect on tracking accuracy; the only time I did
notice significant tracking drift was on a target transiting at 80
degrees, where the telescope often has trouble (and the drift wasn't
in the altitude direction, anyway).
Otherwise no trouble with the telescope or instruments.
                       ------- 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
 ----------------------------------------------------------------------
 18:53 dis-slit     8(  -43) 179  70   5.8  7.0  6.2  6.1  5.3   -  1.10
 00:48 dis-slit    90(  -85) 172  79   5.3  4.7  4.8  4.1  4.4   -  1.50
                ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    -------------------------------------------------------------------
     16:00    49     2      3   208  (SSW)   1232  ptly cldy   none
     17:00    44    -1      5   209  (SSW)   1311  ptly cldy   none
     18:00    42    -2      7   191    (S)   1551  ptly cldy   none
     19:00    42    -2      7   185    (S)   1636  ptly cldy   none
     20:00    41    -2     10   185    (S)   2041  ptly cldy   none
     21:00    41    -2      9   176    (S)   1818  ptly cldy   none
     22:00    42    -2      8   182    (S)   1688  ptly cldy   none
     23:00    42    -1      7   208  (SSW)   1684  ptly cldy   none
     00:00    42     0     10   210  (SSW)   1654  ptly cldy   none
     01:00    41     0      7   209  (SSW)   2599  ptly cldy   none
     02:00    42     1      6   208  (SSW)   2638  ptly cldy   none
     03:00    44     3      1   223   (SW)   2635  ptly cldy   none
     04:00    45    11      6   292  (WNW)   2295 mstly clr    none
     05:00    44    10      7   256  (WSW)   2439 mstly clr    none
     06:00    44    14      9   270    (W)   2580 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: 2.10.0
      Current TUI version: TUI 1.5.1