Date: Fri, 2 Apr 1999 07:03:04 -0700 (MST)
From: Russet McMillan
Subject: 3.5m Night Log 990401
Content-Type: TEXT/PLAIN; charset=US-ASCII
                          THURSDAY APRIL 1, 1999
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Stubbs            Gloria             SPIcam     4/1      -     -
Stubbs        Gloria, McMillan       SPIcam    4/1-2     -     -
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
UW02/S     19:47 20:37    -   0.8   -    0    -    0    0    -    0
EN01/S     20:37 04:27    -   7.8   -    0    -    0    0    -    0
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
1st half observing specialist: Karen Gloria
The telescope remained closed for the first half of the night, due to
a very high amount of dust in the air.  The dust counter peaked at
over 20x our shutdown level.  Holloman and Alamogordo were invisible
from APO this afternoon as the observatory and surrounding area were
enveloped in a white "fog" of gypsum dust.
2nd half observing specialist: Russet McMillan
Dust counts gradually decreased during second half, but just as they
crossed below the limit, the wind gusts picked up.  By the time
conditions were acceptable for opening, it was 15 minutes before
twilight -- too late to accomplish any of our engineering goals.
The telescope was never opened.
                            OBSERVER COMMENTS
                                FOCUS LOG
                              APRIL 1 1999
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
#First temp is air, second temp is telescope.
                                 WEATHER
                              APRIL 1 1999
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    48    11     22   246  (WSW)  46834     dusty     gypsum
     17:01    45    12     16   232  (SW)   74330     dusty     gypsum
     18:01    43     8     26   246  (WSW)  34651     dusty     gypsum
     19:01    41     9     27   213  (SSW)  32067     dusty     gypsum
     20:01    40    10     17   237  (WSW)  33034     dusty     gypsum
     21:01    39    13     22   229  (SW)   27322     dusty     gypsum
     22:01    38    16     22   208  (SSW)  21548     dusty     gypsum
     23:01    37    18     16   200  (SSW)  13841     dusty     gypsum
     00:01    35    19     23   201  (SSW)   9403    ptly cldy   none
     01:01    34    19     23   209  (SSW)   6010    ptly cldy   none
     02:01    33    18     17   192  (SSW)   6392     clear      none
     03:01    33    17     21   197  (SSW)   4494     clear      none
     04:01    32    20     21   187  (S)     2542     clear      none
     05:01    32    18     25   194  (SSW)   1944     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.
- Karen Gloria, Russet McMillan