From: "Camron Hastings"
Subject: 3.5m Night Log 20000815
Date: Wed, 16 Aug 2000 05:23:12 -0600
                       APACHE POINT OBSERVATORY
                       3.5m Telescope Night Log
                       Tuesday, Aug 15th, 2000
                                                          ACTUAL
 ASTRONOMER     OBSERVER(S)        INSTRUMENT   DATE   START  FINISH
 --------------------------------------------------------------------
 B.Gillespie    C.Hastings         S-H, NA2Gdr  8/15   20:30  05:43
                P.Doherty          Fast Guider
                J.Davis, J.Morgan
  INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
 I/RO/DN    START  FINISH  D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 EN01/O     20:45  05:31   -    0    -    0    -   8.8   0    -    0
 note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
Observing Specialist, 1st & 2nd Shift: Noel Camron Hastings
    I opened the dome for cooling at 18:05 partially while engineering
work continued. The new pneumatic system was installed for eyelid and
tertiary control. There are minor changes to the operation of eyelids
now which will be solidified in the next couple of days.
    We started the evening with work on the Fast Guider. We were waiting
for the seeing to improve before we started on collimation items. We
started on M1 collimation at 23:30 MDT. We zeroed out the mirror tilts
for M2 and then hand adjusted M3. We were surprised to find that the
collimation was still very good at 60 degrees after the tip/tilt values
had been zeroed. Since the collimation appeared good we could forego the
pointing model. We instead tried to focus on the image motion at high
altitudes.
    Upon closer scrutiny, we noticed that the mirror appears to move off
the T load cell at high altitude. There is definitely a lot of movement
of the primary at high altitudes in the transverse direction, but not
enough to affect collimation seriously to the eye. The Shack-Hartmann
measurements became useless about the same time we started these
measurements due to the seeing jumping to 3-4 arcsecs! I waited around
after this to see if the seeing would improve enough for another
altitude sweep.
    The seeing did not improve much. Jeff Morgan and I worked on doing
throughput measurements with the NA2 guider and made a rough comparison
with data from 3 years ago. We found enough of a change in flux that we
will reduce this data carefully so that we can give a firm estimate of
accurate throughput loss.
        --------------- INSTRUMENT FOCUS LOG ----------------
                                     Air/Truss   Wind
Time  Instrument  Focus     Az  El   #Temp-C    Dir MPH  filt   FWHM"
---------------------------------------------------------------------
21:30 FG Cam   1100(????)  -62  38   13.7/14.4  113  19  none   ?.??"
23:05 SH Cam   -025(1686)  -86  62   13.7/14.6  114  16  none   ?.??"
03:30 NA2 gdr -4800(1320)  088  54   12.6/12.8  084  10   R     1.96"
              ------------- WEATHER CONDITIONS ------------
                               Wind                          Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky  Conditions
    ------------------------------------------------------------------
     16:01    67    30     10   107  (ESE)   1085   photometric  none
     17:01    67    31      9    73  (ENE)    940   photometric  none
     18:01    66    31     15    75  (ENE)    833   photometric  none
     19:01    64    32     12   111  (ESE)    777   photometric  none
     20:01    61    32     12    86  (E)      799   photometric  none
     21:01    60    35     14   103  (ESE)    966   photometric  none
     22:01    58    36     20   113  (ESE)    963   photometric  none
     23:01    57    40     13   110  (ESE)   1062   photometric  none
     00:01    55    44     17   110  (ESE)   1164   photometric  none
     01:01    55    45     11    88  (E)     1179   photometric  none
     02:01    57    38     14   110  (ESE)   1214   photometric  none
     03:01    57    35     12    82  (E)     1079   photometric  none
     04:01    55    44     11    85  (E)     1142   photometric  none
     05:01    54    45     11    78  (ENE)   1202   photometric  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: 2.62.
Current guide software version: GIm Ctrlv3.0b27. Current TCC version
is 2.4.0b1 Current MC version: v1_7_3.
-- Noel Camron Hastings