From: Russet McMillan
Subject: 3.5m Night Log 20000220
Date: Mon, 21 Feb 2000 06:49:58 -0700 (MST)
                          SUNDAY FEBRUARY 20, 2000
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Gonzalez	Gonzalez	   SPIcam	2/20   18:47 23:58
Wyse		Wyse		   GRIM		2/21   00:23 05:47
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UW13/R     18:47  00:10  0.4  1.7   0    0    0   3.3   0    0    0
JH03/R     00:10  05:47   -   0.8   -    0    -   4.8   0    -    0
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
First-Half Observing Specialist: Deglman
Delayed opening due to moderately thick cirrus and high dust count.
Some SPIcam calibration images were taken for UW13.  Opened at 19:35
under cirrus conditions.  Skies eventually cleared off.  Turned
pressurization fans on at 21:05 due to high enclosure dust count.
Closed at 22:55 due to high dust count.
Second-Half Observing Specialist: McMillan
Second half was clear, with high dust and humidity levels part of the
time.  We re-opened at 00:10 just in time to start the second half
observations.  * The enclosure dust counter was reading more than
twice as high as the tower counter; when I used the handheld counter
to check, it was getting values considerably lower than either of the
others -- even when it took counts just a few feet away from the
enclosure counter.  The decision to close between 02:10 and 03:00 was
based as much on the humidity as on the dust, since both were hovering
very near the closure limits.
While we were open, both GRIM and the telescope behaved well except
for one minor but strange glitch in the remote observer's Remark.  The
exposure sequence numbers spontaneously reset to a lower value, and at
about the same time the sign of an offset, though appearing to be
positive in the offset control window, kept coming through as
negative.  (These were Object offsets, which have the same sign in the
MC as Remark.)  The sequence numbers were easily reset, and the
offsets were fixed when "Clear offset" was pushed and the numbers
re-entered, so this was not a serious problem.
                            OBSERVER COMMENTS
                                FOCUS LOG
                             FEBRUARY 20 2000
                                                 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
19:50  SPIcam    40(386)    188  81  7.2/7.6   198   16  H-a   0.85
22:15  SPIcam   -40(401)    334  39  6.6/6.4   196   19  Hodge 0.99
00:25 GRIM(f/5) 100(629)    164  51  6.1/5.8   206   20   J    0.94
#First temp is air, second temp is telescope.
                                 WEATHER
                            FEBRUARY 20 2000
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     17:01    45    34     12   159  (SSE)   2956   hvy cirrus   none
     18:01    44    35     16   181  (S)     3275   hvy cirrus   none
     19:01    43    32     16   193  (SSW)   2232     cirrus     none
     20:01    46    14     12   199  (SSW)   1127     clear      none
     21:01    45    20     15   194  (SSW)   1594     clear      none
     22:01    44    27     15   188  (S)     2249     clear      none
     23:01    43    35     17   195  (SSW)   2873     clear      none
     00:01    43    34     22   207  (SSW)   2818     clear      none
     01:01    42    35     14   200  (SSW)   2942     clear      none
     02:01    41    35     15   208  (SSW)   3182     clear      none
     03:01    41    28     15   228  (SW)    1996     clear      none
     04:01    40    28     12   237  (WSW)   1821     clear      none
     05:01    40    24     16   245  (WSW)   1155     clear      none
     06:01    37    22     14   241  (WSW)    940     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: 2.55b5.
Current guide software version: GIm Ctrlv3.0b27.  Current TCC version
is 2.2.2.
- Frank Deglman, Russet McMillan