Date: Mon, 29 Jun 1998 06:35:27 -0600 (MDT)
From: Tia Hoyes
Subject: 3.5m obslog 980628
                         SUNDAY   JUNE  28, 1998
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                    ACTUAL
ASTRONOMER       OBSERVER          INSTRUMENT   DATE   START FINISH
Stubbs           Palunas              GFP       6/28   20:15 01:05
Zucker           Zucker              SPICAM     6/28   01:10 06:00
 INST        SCHEDULED      OBS      WEATH     EQUIP   DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UW09/O     21:57 01:10   1.5  1.7   0    0    0    0    0    0    0
UW06/R     01:10 04:16   3.1   0    0    0    0    0    0    0    0
(note: times listed include instrument change time)
                               ACTIVITY LOG
The telescope was open tonight at 19:00.
Povilas Palunas and Meena Sahu were on site with the GFP instrument. They had
the first half of the evening.
Comments:We were again troubled by pointing errors, as the offsets we
used yesterday did not bring us back to the same place.
The pointing was off by over 2arcmin. The sign of
the x-offset mysteriously reversed moving the telescope
in the opposite direction from yesterday adding to our troubles.
We lost 30min.
The night began with auspicious seeing, .6" in short .1 sec
focus exposures. Our first science image yielded 1arcsec seeing.
However, subsequent exposures degraded and we ended our
evening with 2arcsec seeing.
Povilas Palunas and Meena Sahu
Dan Zucker was available for the second half of the evening.
Comments:The weather was not cooperative tonight -- the sky was hazy and seeing
was 3 arcseconds or worse for a good fraction of my run, although
seeing eventually dropped to about 2 arcseconds. I had a couple of
apparent rotator-trailed short images, including a focus frame. Again,
Tia's reinitializing of the axes and pointing error corrections seemed
to help. The guider worked wonderfully, even with the awful seeing at
the beginning of my run, and the graph of guider offsets suggested that
the guider was compensating well for the problem with the tracking
rate.*
(* means a trouble report has been issued or appended to)
                               FOCUS LOG
                             JUNE  28, 1998
                Best     Telescope               Wind                 Seeing
Time   Inst     Focus     Az    El   Temp#      Dir  MPH     filter   FWHM "
21:10  GFP   +130(6838) 251.5  77.5 22.7/24.62 177.5 12.1     7964    0.6
21:16 GUIDER    56263   256.1  75.4 22.8/24.45 178.8 11.8     empty   1.44
01:25 SPICAM -400(6492)  83.4  51.2 17.6/18.35 131.8 26.4      V      2.17
02:30 SPICAM -350(6420)  91.6  65.4 18.0/17.86 146.8 22.5     H alpha 1.45
# The first temp is air, the second is truss, both in degrees C.
                                 WEATHER
                               JUNE  28,  1998
                                 Wind
    Time   Temp F Dewp.   MPH.    Dir.       DUST     Sky         Precip.
     16:01    85    13      6   265  (W)      206    clear         none
     17:01    85    15      9   241  (WSW)    220    clear         none
     18:01    83    16     17   216  (SW)     308    clear         none
     19:01    80    15     15   189  (S)      284    clear         none
     20:01    76    14     11   201  (SSW)    283    clear         none
     21:01    73    15     10   165  (SSE)    358    clear         none
     22:01    72    17     16   161  (SSE)    434    clear         none
     23:01    68    33     25   140  (SE)    1664    clear         none
     00:01    65    41     21   130  (SE)    2600    clear         none
     01:01    64    42     20   127  (SE)    1192    clear         none
     02:01    63    41     24   127  (SE)     962    hazy          none
     03:01    65    36     16   164  (SSE)    883    hazy          none
     04:01    65    35     19   171  (S)      911    hazy          none
     05:01    65    31     13   179  (S)      795    hazy          none
     06:01    65    29     15   180  (S)      799    hazy          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: 2.41a
Current guide software version:GIm Ctrl v3.0b 15.out
-Tia