From: Russet McMillan
Subject: 3.5m Night Log 990320
Date: Sun, 21 Mar 1999 06:49:31 -0700 (MST)
                         SATURDAY MARCH 20, 1999
                          APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Strauss         Strauss, Fan          DIS       3/20   19:37 00:10
Austin		Austin		      DIS	3/21   00:10 04:44
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
PU01/R     19:37 00:10    0    0    0    0   2.4  2.1   0    0    0
WS01/R     00:10 04:44    0    -    0    -   4.6   -    0    0    -
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Observing specialist: Russet McMillan
Tonight was clear aside from some cirrus at sunset, and largely
uneventful.  Seeing was moderately poor.  The humidity rose abruptly
early on, but never reached the limit, and it dropped again after
about an hour.
As noted on some previous nights, the leak at the top of the DIS dewar
was quite severe in the afternoon; the instrument used 15 lbs of
nitrogen between 11:00 and 16:00, and its pressure dropped to zero.
As soon as a large dewar was hooked up for pressure-building, another
instrument fill started -- but it lasted less than a minute.  During
the night, DIS maintained pressure and temperature adequately.
* There was a repeat of the problem described yesterday during stow
procedures; since it now appears to be repeatable, I detailed it in a
problem report.  Another interesting matter came up, however.  This
time, when the alt motors began to complain, I issued an "axis stop"
to stop the telescope, which seemed to work.  But when I sent a new
rotate command, the azimuth and altitude axes both started moving as
well.  This sounds like a potential problem.
                            OBSERVER COMMENTS
M.Strauss (PU01):
Another good night, with no problems to report.  Observing tonight
was particularly efficient; we bagged 6 objects, four of which are
quasars.
                                FOCUS LOG
                              MARCH 20 1999
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
18:50  slitcam   -50(6414)  229  45  4.3/7.2   125  20    --
18:55  guider  56200(6412)  230  44  4.2/7.0   125  20   none  1.8
19:25  slitcam  -175(6254)  237  39  3.1/5.4   114  17    --
20:35  slitcam  -275(6095)  242  35  3.0/3.3   113  14    --
#First temp is air, second temp is telescope.
                                 WEATHER
                              MARCH 20 1999
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    46    29     11   202  (SSW)    629     cirrus     none
     17:01    45    29      9   211  (SSW)    458     cirrus     none
     18:01    42    25      8   148  (SSE)    445     cirrus     none
     19:01    39    24     13   111  (ESE)    410     clear      none
     20:01    37    30     11   110  (ESE)    548     clear      none
     21:01    37    25     11   108  (ESE)    518     clear      none
     22:01    39    17      9   127  (SE)     599     clear      none
     23:01    41    11     11   162  (SSE)    811     clear      none
     00:01    41     8      9   172  (S)      830     clear      none
     01:01    42    11      8   181  (S)      877     clear      none
     02:01    40    15     11   206  (SSW)    784     clear      none
     03:01    41    15     10   196  (SSW)    777     clear      none
     04:01    41    17      3   189  (S)      674     clear      none
     05:01    40    16      7   184  (S)      700     clear      none
     06:01    41    17     12   181  (S)      649     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