From: Russet McMillan
Subject: 3.5m Night Log 20000115
Date: Sun, 16 Jan 2000 07:06:28 -0700 (MST)
                         SATURDAY JANUARY 15, 2000
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)       INSTRUMENT   DATE    START FINISH
Szkody          Szkody              DIS        1/15    18:17 00:08
York            Mallouris         Echelle      1/16    00:13 06:09
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UW01/R     18:17 00:10    -    0    -    0    -   5.9   0    -    0
UC09/R     00:10 06:09    0    0    0    0   4.0  1.9   0    0    0
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Observing specialist: McMillan
The telescope was opened at 17:00 for cooling under very light cirrus
which later became clear skies.  Seeing was subarcsecond when we
focused DIS, in basic agreement with the measurements from DIMM, and
remained good to moderate all evening.
Using DIS with the telescope in the NE (near a moderate wind), I
noticed the star would often jump one half to one arcsecond toward the
upper left (WNW) on the slitviewer.  Then it would slowly drift back
to the starting position.  As the target tracked towards the meridian,
the jumps became more due west.  The jumps became more common as we
got closer to the wind direction, a period in which the wind also
increased slightly from an average of about 15 mpg to 18 or 19 mph.
Then after another hour or so on the same target, with no appreciable
change in the wind, the jumps went away and we were left with a
gradual tracking drift towards the NNW.  After the telescope crossed
the meridian, there were a few smaller jumps toward the WSW, but
tracking was generally much improved.
Tracking with the echelle during second half was reasonably good, with
no particular systematic behavior until the telescope got to a high
airmass in the WSW -- then the star showed a persistent drift downward
in the Mac view of the slitviewer.
                            OBSERVER COMMENTS
                                FOCUS LOG
                             JANUARY 15 2000
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
18:10  DISslit   150(1267)   45  50  7.9/8.8    28   18   --   0.98
00:30  Echelle    93(303)   132  51  8.5/8.6    25    9  clear 0.90
03:40  Echelle   141(278)   219  55  9.0/7.7   300    1  clear 0.87
#First temp is air, second temp is telescope.
                                 WEATHER
                             JANUARY 15 2000
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    48    -6      8    28  (NNE)    239     cirrus     none
     17:01    47    -4      7    20  (NNE)    156     cirrus     none
     18:01    47     9     15    29  (NNE)     83     cirrus     none
     19:01    47    20     12    24  (NNE)     51    mstly clr   none
     20:01    48    14     18    26  (NNE)     44     clear      none
     21:01    48    10     19    25  (NNE)     63     clear      none
     22:01    48    11     15    29  (NNE)    190     clear      none
     23:01    48    11     15    47  (NE)      64     cirrus     none
     00:01    49    11     10    22  (NNE)     97     clear      none
     01:01    46    12      5     6  (N)      107     clear      none
     02:01    47    11      6    13  (NNE)    133     clear      none
     03:01    48    11      0   349  (NNW)    124     clear      none
     04:01    48    11      0    81  (E)      132     clear      none
     05:01    49    11      4   273  (W)       96     clear      none
     06:01    48    11      4   279  (W)       95     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
> 1 micron per 0.1 cu. ft.
                             TELESCOPE STATUS
Primary, secondary, and tertiary mirrors in place and collimated.
Primary support system operational.  Mirror ventilation system in
place.  Telescope drives operational.  Current Remark version: 2.55b5.
Current guide software version: GIm Ctrlv3.0b27.  Current TCC version
is 2.2.2.
- Russet McMillan