Date: Mon, 12 Oct 1998 07:44:39 -0600 (MDT)
From: Russet McMillan
Subject: 3.5m obslog 981011
                         SATURDAY OCTOBER 11, 1998
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
King            King                  DIS       10/11  19:45 06:45
 INST        SCHEDULED      OBS      WEATH     EQUIP   DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
NM04       19:45 06:45   4.2  5.8   0    0    0    0   0    0    0
(note: times listed include instrument change time)
                               ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Karen Gloria reported that she opened at 19:45 MDT to cirrusy
weather.  DIS was behaving well after the hardware modifications to
the cooling system during the day.  The telescope pointing was
unreliable, particularly in altitude.
Russet McMillan: DIS continued to maintain temperature well throughout
the second half.  We only made a few long slews -- on one the pointing
was off by over 30", and on most others the pointing was fine.  We had
one jump in tracking, while no guiding was on -- this was near the
same position where the same thing happened last night (with guiding
on):
          AZ     EL     ROT
10/10   -122.4  68.9  -111.2
10/11   +241.4  62.5  -117.9
The sky cleared around midnight, but the wind also picked up.  By 1am
the seeing had become much worse, and Pat Waddell reported ugly images
from the 2.5m at the same time.  After 3am the wind died down again
and the seeing improved somewhat.
OBSERVER COMMENTS
Everything went pretty smoothly tonight except for the small telescope
skip near 3:30am again (looking at M31).  For the hour before and
after objects were transiting meridian (near zenith), found that
using the slit viewer for offsets during an exposure (instead of
guide star) worked well.  We saw Mothra in the sky-cam earlier.
                                 FOCUS LOG
                              OCTOBER 11 1998
                  Best      Telescope             Wind          Seeing
Time   Inst       Focus      Az  El   #Temp      Dir MPH  filt  FWHM "
19:50  DIS        -200       93  68  13.7/15.9   ???       r    0.95
20:00  DIS        -150       95  69  13.2/15.8   ???      none  1.1
21:15  guider  53200(6552)   63  53  11.3/13.3   ???       R    1.6
00:35  DIS(slit)  -150      291  58   9.7/10.9  100 ~10   none  1.9
04:00  DIS(slit) -25(6592)  -62  48  12.5/10.7  130 ~3    none  1.4
#The first temp is air, the second is truss, both in degrees Celsius
Azimuth is measured from North to East
                                  WEATHER
                              OCTOBER 11 1998
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    66    13                                Cirrus     None
     17:01    61    10                                Cirrus     None
     18:01    61    13                                Cirrus     None
     19:01    57    14                                Cirrus     None
     20:01    56    17                                Cirrus     None
     21:01    55    18                                Cirrus     None
     22:01    53    16                                Cirrus     None
     23:01    53    16                                Clearing   None
     00:01    52    15      8    100                  Clear      None
     01:01    49    25      10    80                  Clear      None
     02:01    48    27      6     90                  Clear      None
     03:01    53    24