Date: Thu, 24 Jul 1997 04:15:06 -0600 (MDT)
From: Charles Corson
Subject: 3.5m obslog 970723
                           WEDNESDAY JULY 23, 1997
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                    ACTUAL
ASTRONOMER   INSTRUMENT   DATE   START FINISH
Rodgers		Grim	  7/23   22:50  01:10
Magnier		Grim      7/24   01:10	04:36
 INST        SCHEDULED      OBS      WEATH     EQUIP   DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UW07/R	   21:45 01:10    0    0.4  0    1.9  1.1  0    0    0    0
UW03/R     01:10 03:35    0    0.9  0    2.5  0    0    0    0    0
PUO1/o     03:35 04:35    0    0    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)
The first hour was used to evaluate and tune the telescope axis.  Both
drives seem functional, and a small tune was done to the primary mirror
support to remove an oscillation in the transverse support.  On sky tests
indicated a 1hz oscillation that was not in line with the elevation or
azimuth axis.  Inspection of the primary mirror support showed a small,
but noticable 1hz oscillation in the transverse support.  This was quickly
tuned out, a very small adjustment,  and the following, quick, on sky
tests showed no image motion.
At this point, the telescope was turned over to B. Rodgers for science.
The seeing was excellent, but conditions did not hold as the dome was
quickly closed due to threatening cloud cover.  No useful data set was
obtained.
The sky cleared again for G. Magnier.  Seeing was again excellent, in fact
stupendous, 0.71arc-sec, H-band.  This value was confirmed with several
stars using a background subtracted image from GRIM.  Gene was able to
image one object before overcast conditions forced closing.
Of concern was the apparent trailing, or possibly jerk, of the azimuth
axis, two events.  The events were transitory and I did not see other
evidence of it occuring.
Guider tests were performed.  After careful focus, pointing corrections
and guiding loops could all be performed with the new guider.  (focus is
essential for the centroiding to succeed; a new centroiding algorithm is
in use)
                                FOCUS LOG
                              JULY 23, 1997
                  Best   Telescope           Wind            Seeing
Time   Inst      Focus    Az  El    #Temp    Dir MPH  filter  FWHM "
22:50  GRIM   200(6904)  125  80   15.3/16.4 354 5    J       0.85
01:30  GRIM   50         186  77   15.6/15.7 296 3    H       0.83
02:15  GRIM   0 (6683)   256  74   15.7/15.6 292 2    H       0.71
#The first temp is air, the second is truss, both in degrees Celsius
                                 WEATHER
                               JULY 23, 1997
                                   Wind
    Time  Temp F  Dewp. F  MPH.	  Dir.       Dust    Sky          Precip.
     16:01    57    52      6    21  (NNE)    673    overcast      none
     17:01    57    51      8    43  (NE)     658    prtly cldy    none
     18:01    62    52      0   258  (WSW)    680    prtly cldy    none
     19:01    58    54      8    32  (NNE)    694    prtly cldy    none
     20:01    59    49      8    46  (NE)     511    prtly cldy    none
     21:01    59    47      4     5  (N)      518    prtly cldy    none
     22:01    61    49      4   353  (N)      722    prtly cldy    none
     23:01    60    47      5     0  (N)      599    prtly cldy    none
     00:01    61    49      4   332  (NNW)    668    prtly cldy    none
     01:01    61    47      3   335  (NNW)    673    prtly cldy    none
     02:01    60    48      0   325  (NW)     667    prtly cldy    none
     03:01    60    47      1   329  (NNW)    636    overcast      none
     04:01    60    47      1   319  (NW)     615    overcast      rain
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: 2.36.
Current guide software version: GImCtrl.1 6.21.97.
-Charles