Date: Mon, 17 May 1999 06:31:49 -0600 (MDT)
From: Russet McMillan
Subject: 3.5m Night Log 990516
                           SUNDAY MAY 16, 1999
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Krisciunas      McMillan            SPIcam      5/16   21:31 22:19
Strauss         Strauss, Fan          DIS     5/16-17  22:44 03:46
Turner          McMillan            SPIcam      5/17   04:11 04:28
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UW02/S     21:31 22:31    0    -    0    -   1.0   -    0    0    -
PU01/R     22:31 03:58    0    -    0    -   5.5   -    0    0    -
PU03/S     03:58 04:28    0    -    0    -   0.5   -    0    0    -
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Observing specialist: R. McMillan
Another nice clear night, with moderate winds and dust.  The telescope
was still pointing 5-10 arcseconds off with each slew, and the errors
accumulated in one direction over many slews.  Even more disturbing,
there was an error of 16 arcseconds in one case immediately afetr a
local pointing correction.
Aside from the continued pointing difficulties, which were manageable,
the telescope and instruments were generally well behaved.  It was
notable that the tracking and guiding were excellent over timescales
of an hour, despite the pointing anomalies.  I obtained good data for
both monitoring programs, although the lensed quasar 2237 was at too
high an airmass to allow the kind of seeing that would resolve its
components.
                            OBSERVER COMMENTS
M.Strauss (PU01):
Another night of good weather and good data.  The observing was
particularly efficient tonight, thanks to Russet's expert help.
                                FOCUS LOG
                               MAY 16 1999
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
20:55  SPIcam    -75(6703)  231  38 11.3/11.5  274   22    R    1.22
21:00  guider  -3385(46615) 234  46 11.4/11.6  273   22         1.3
22:35  slitcam   +50(6559)  105  70 10.4/10.3  284   19   --
22:40  guider   2668(54668) 105  70 10.4/10.3  284   19         1.0
03:20  SPIcam    -75(6461)  107  29  8.3/8.1   326   19    g'   1.72
03:25  guider  -1630(48368)                                     1.5
#First temp is air, second temp is telescope.
                                 WEATHER
                               MAY 16 1999
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    62    18     22   239  (WSW)   1052     clear      none
     17:01    59    16     20   259  (W)      975     clear      none
     18:01    59    14     19   262  (W)     1204     clear      none
     19:01    58    14     22   256  (WSW)   1375     clear      none
     20:01    53     9     13   265  (W)     1258     clear      none
     21:01    53    10     18   269  (W)     1106     clear      none
     22:01    52     8     18   288  (WNW)   1164     clear      none
     23:01    51     8     10   279  (W)     1112     clear      none
     00:01    51     8      8   303  (WNW)   1001     clear      none
     01:01    50     7     12   297  (WNW)   1085     clear      none
     02:01    49     7     19   292  (WNW)   1020     clear      none
     03:01    47     5      5   316  (NW)     999     clear      none
     04:01    47     6     17   327  (NNW)    984     clear      none
     05:01    47     8     14   316  (NW)     965     clear      none
     06:01    46     9     13   306  (NW)    1074     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: 2.52
Current guide software version: GIm Ctrlv3.0b17.
- Russet McMillan