Date: Thu, 22 Apr 1999 05:22:39 -0600 (MDT)
From: Russet McMillan
Subject: 3.5m Night Log 990421
                         WEDNESDAY APRIL 21, 1999
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Staff             Staff              Amber    4/21-22    -     -
Staff             Staff              guider     4/22   01:30 04:15
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
EN01/S     21:05 01:10    -   4.1   -    0    -    0    0    -    0
EN01/S     01:10 04:58   0.7  0.3   0    0   2.5  0.3   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
Due to dusty weather, the telescope was not opened during the first
half of the night.  We had planned to do engineering work with the
Amber camera.
2nd half observing specialist: Russet McMillan
The dust counts dropped somewhat during second half, and we opened
from 01:30 to 04:15.  During this time the telescope was exposed to
moderate dust levels, so it should probably be CO2-cleaned.
The open time was long enough for Russ Owen to try out his new
pointing model software, find some bugs, and fix them.  After that, we
ran a full pointing model.  There was some trouble at the beginning
due to a rapidly-changing focus, and several points had to be deleted,
but eventually we got a model with RMS less than 4 arcseconds.  When
this model was output, it somehow overwrote the previous model without
changing the date on the file.  So the new model is in
tdat:telmod_na2.dat;91 -- the same version number as the previous
model.  I managed to save a copy of the earlier (990223) model into
version 90.
                                FOCUS LOG
                              APRIL 21 1999
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
#First temp is air, second temp is telescope.
                                 WEATHER
                              APRIL 21 1999
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    57    15     33   269  (W)     2457     cirrus     none
     17:01    55    13     37   260  (W)     2676     hi clds    none
     18:01    57    15     21   263  (W)     4399     hi clds    none
     19:01    54    14     24   265  (W)     4444     hi clds    none
     20:01    52    14     23   262  (W)     6016     hi clds    none
     21:01    51    16     25   271  (W)     9217     hi clds    none
     22:01    49    17     20   268  (W)     9094     hi clds    none
     23:01    49    17     22   266  (W)     9285     cirrus     none
     00:01    49    17     24   262  (W)     5623     cirrus     none
     01:01    47    16     17   263  (W)     3716     cirrus     none
     02:01    46    18     22   244  (WSW)   2757     cirrus     none
     03:01    46    16     18   262  (W)     1848     cirrus     none
     04:01    44    19     20   214  (SW)    2731     cirrus     none
     05:01    42    20     19   246  (WSW)   2862     cirrus     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