Date: Sun, 29 Aug 2004 06:03:37 -0600 (MDT)
From: John Barentine
Subject: 3.5m Night Log 20040828
                         Apache Point Observatory
                         3.5m Telescope Night Log
                         Saturday, August 28, 2004
                                                          ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 S.Kent          R.McMillan             CorMASS        19:50  01:00
 T.Snow          M.Drosback             Echelle        01:00  01:40
  INST        SCHEDULED      WEATH     EQUIP     OBS     DAY  NOT USED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 ---------------------------------------------------------------------
 UC04/O      20:28  01:00   0    0    0    0    0   4.5   0    0    0
 CU02/R      01:00  05:41   0   4.0   0    0    0   0.7   0    0    0
 note: scheduled times listed include instrument change time
                  ------------- ACTIVITY LOG --------------
 Observing Specialist: J.Barentine
 Open just after 19:00 for cooling.  Skies were generally clear, but an
east wind was blowing by sunset.  Shortly thereafter, the humidity began
to climb.  It leveled off just short of the closure condition and then
backed off; the rest of the half was quiet with variable (but often
reasonable) seeing, despite the east wind.
 In the half-hour before the shift change, we began to get clouds out of
the northwest which, by 01:00, covered most of the sky.  There was no
indication of precipitation on radar and humidity remained steady in the
60% range, so I opted to stay open.  I verified pointing with the Echelle
and did a focus loop before handing over to Meredith.  Almost as soon as
she started science exposures, the rain sensor tripped without warning. I
closed the mirror covers and ran upstairs ASAP yet found the primary had
some rain spots on it already.
 In short order, it went from light rain to a fairly heavy downpour by
01:50.  I went outside and covered the cloud camera.  Around 02:30 I
opened up again after the rain stopped, but within minutes, another band
of clouds moved in and I ran outside again to cover the camera.  Meredith
gave up just after 05:30.
                      ------- FAILURE LOG -------
  PROG   INST   FAILURE MODE     TIME
       (SEGDFVO)    TI/SHU   START  FINISH  DESCRIPTION
 -----------------------------------------------------------------------
                 ---------------- FOCUS LOG ---------------
                                          Air/Truss   Wind
 Time   Instrument   Focus     Az  El    Temp-C    Dir MPH  filt  FWHM
 ---------------------------------------------------------------------
 20:19 cormass     -250(1320)  -94 74  11.7/16.3  75   13   -     0.00
 20:24 NA2gdr      -2000(32000)-94 73  11.7/15.9  78   14   R     1.23
 01:27 Echelle     -50(477)    176 74  11.5/12.8  100  6    clear 1.07
                ------------- WEATHER LOG ----------------
                                  Wind                       Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
     ------------------------------------------------------------------
     16:01    67    42     10   266  (W)           MstlyClr     none
     17:01    69    44      6   215  (SW)          MstlyClr     none
     18:01    67    45     12   214  (SW)          MstlyClr     none
     19:01    62    46      3   260  (W)            Clear       none
     20:01    54    48     12    74  (ENE)          Clear       none
     21:01    53    47     10    61  (ENE)          Clear       none
     22:01    54    44      8    80  (E)            Clear       none
     23:01    56    41      5    87  (E)            Clear       none
     00:01    57    40      0   196  (SSW)         PtlyCldy     none
     01:01    54    42      6   108  (ESE)         MstlyCldy    none
     02:01    52    44      3   104  (ESE)         MstlyCldy    none
     03:01    51    44      1   141  (SE)          MstlyCldy    none
     04:01    53    44      9   189  (S)           MstlyCldy    none
     05:01    54    41      6   156  (SSE)         MstlyCldy    none
     06:01    53    43      2   196  (SSW)         MstlyCldy    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
     Telescope drives operational. Current Remark version: 2.85b
     Current TCC version: 2.7.2  Current TUI version: TUI 90b2