From: Russet McMillan
Subject: 3.5m Night Log 20010430
Date: Tue,  1 May 2001 05:53:56 -0600 (MDT)
                        APACHE POINT OBSERVATORY
                        3.5m Telescope Night Log
                        Monday, April 30th, 2001
                                                          ACTUAL
 ASTRONOMER    OBSERVER(S)             INSTRUMENT      START  FINISH
 --------------------------------------------------------------------
 M.Strauss     X.Fan, V.Narayanan      GrIm/DIS-Low    18:29  05:25
   INST        SCHEDULED     WEATH     EQUIP     OBS     DAY  NOTUSED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 PU02/R      20:41 05:19    0    0    0   0.8  2.5  5.3   0    0    0
  note: scheduled times listed include instrument change time
                 ------------- ACTIVITY LOG --------------
 Observing Specialist 2nd Half: Camron Hastings
    During calibrations early in the evening GrIm had a chip failure. The
upper right quad amplifier croaked. It took about 5 instrument power
cycles but it came back on. The good news is that the temp sensors are
working again now!
    After the Princeton team finished calibrations with GrIm, I opened
the dome to cool at 19:55 MDT. From 20:55 to 21:45 GrIm was again with
chip problems. Many instrument restarts and ICC restarts as well did not
fix it. The chip condition began to deteriorate, 3 quads dead and the 4th
questionable, so we removed GrIm from service and switched to DIS. All
ran smoothly after that.
    Dust rose past limits at about 22:25. I switched fan configurations
around and we brought dust back to limit.
 Observing Specialist 2nd Half: Russet McMillan
 Second half went smoothly, aside from the difficulties of following
 the focus with the telescope fans off for several hours.  The focus
 went up to +200, then descended back to 0 once the dust dropped and I
 was able to turn the fans back on.  Since all the focus changes were
 done during observations rather than a dedicated focus run, they
 aren't listed in the focus log.  Seeing ranged from nearly 2 arcsec
 to just under 1 arcsec during the last two hours of the night.
 During observations of one target, there were signs of oscillation in
 an unknown component of the telescope, causing image elongation.
 This didn't prevent observations, although it did make it difficult
 to monitor the focus.  Other targets in the same part of the sky
 (with the same wind pattern) showed no trouble.
         --------------- INSTRUMENT FOCUS LOG ----------------
                                       Air/Truss   Wind
 Time   Instrument   Focus     Az El    Temp-C    Dir MPH  filt   FWHM"
 ----------------------------------------------------------------------
 20:31  GrIm f/10 -180(1067)  -02 82  13.5/14.8   355   3    J    0.62"
 21:36  DIS Slit     0(1099)   10 58  12.9/13.4    19  12  none   1.13"
              ------------- WEATHER CONDITIONS ------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:03    58    18      5   335  (NNW)   1380   clear      none
     17:03    59    18     13   300  (WNW)   1410   clear      none
     18:03    61    20      7   277  (W)     1549   clear      none
     19:03    57    18      4   329  (NNW)   1764   clear      none
     20:03    54    19      6   307  (NW)    1694   clear      none
     21:03    55    18      9     7  (N)     1908   clear      none
     22:03    56    12      6    27  (NNE)   2481   clear      none
     23:03    53    13      6    22  (NNE)   2531   clear      none
     00:03    55    13      2   274  (W)     2588   clear      none
     01:03    55    12      3   257  (WSW)   2315   clear      none
     02:03    54    14      7   261  (W)     1937   clear      none
     03:03    53    14      7   257  (WSW)   1654   clear      none
     04:03    53    12     10   238  (WSW)   1675   clear      none
     05:03    54     6     10   259  (W)     1574   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
  > 1u per 0.1 cubic feet.
                              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: 2.5.1
  Current MC version: v1_7_3.