Date: Wed, 26 May 1999 05:12:48 -0600 (MDT)
From: Russet McMillan
Subject: 3.5m Night Log 990525
                          TUESDAY MAY 25, 1999
                         APACHE POINT OBSERVATORY
                              OBSERVING  LOG
                                                          ACTUAL
ASTRONOMER      OBSERVER(S)        INSTRUMENT   DATE   START FINISH
Strauss         Fan, Strauss          DIS       5/25   21:40 00:45
Diercks           Diercks            GrIm2      5/26   00:10 01:10
Kron              Holden             GrIM2      5/26   01:10 04:20
 INST        SCHEDULED     WEATH     EQUIP      OBS    DAY   NOTUSED
I/RS/DN    START FINISH   D    B    D    B    D    B   USE   D    B
PU01/R     21:40 00:10    -    0    -   0.5   -   2.0   0    -    0
UW01/R     00:10 01:10    -    0    -    0    -   1.0   0    -    0
UC07/R     01:10 04:20    0    0    0    0   0.2  3.0   0    0    0
(note: times listed include instrument change time)
                              ACTIVITY LOG
(* means a trouble report has been issued or appended to)
Observing specialist:  R. McMillan
The weather was much nicer than forecast; except for a few patchy
clouds in the evening, it was clear and quite dry.  During second
half, GRIM was able to get consistent sub-arcsecond seeing.
The pointing was poor but not terrible.  As noted before, a definite
drift was seen in multiple slews with drift -- each slew had a small
error, but they were all in the same direction.
The only real difficulty of the night was in keeping DIS warm.
Apparently the dewar feeding it was unable to maintain enough pressure
to fill the instruments.  When I swapped in another dewar, the problem
appeared to clear up.  Forced cools took some time away from PU01.
                            OBSERVER COMMENTS
                                FOCUS LOG
                               MAY 25 1999
						 Wind
Time   Inst        Focus     Az  El   #Temp    Dir  MPH  filt  FWHM "
20:35 slitcam    50(6731)   173  57 12.1/13.0  261  20    --    1.3
00:10  GRIM     -30(6602)    60  81 11.6/11.0  267  13     J    0.95
02:15  GRIM     +70(6699)   -20  74 11.5/10.6  270  13  Kshort  0.92
02:15  GRIM     +50(6834)   -97  33 10.9/10.7  248  13  Kshort  0.89
#First temp is air, second temp is telescope.
                                 WEATHER
                               MAY 25 1999
                               Wind
     Time   Temp F Dewp F  MPH  Direction    Dust      Sky      Precip.
     16:01    57    26     18   240  (WSW)   1267   ptly cldy    none
     17:01    57    22     14   286  (WNW)   1326   ptly cldy    none
     18:01    60    24     17   261  (W)     1245   mstly clr    none
     19:01    57    22     17   270  (W)     1480   mstly clr    none
     20:01    53    21     15   279  (W)     1313     clear      none
     21:01    54    19     15   266  (W)     1357   ptly cldy    none
     22:01    54    19     14   271  (W)     1377   mstly clr    none
     23:01    53    20     13   271  (W)     1441     clear      none
     00:01    51    20      9   272  (W)     1483     clear      none
     01:01    51    21      9   264  (W)     1538     clear      none
     02:01    52    20      8   257  (WSW)   1460     clear      none
     03:01    52    20     10   265  (W)     1485     clear      none
     04:01    50    21      6   240  (WSW)   1440     clear      none
     05:01    47    24      4   261  (W)     1442     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 Ctrlv3.0b18.
- Russet McMillan