Date: Tue, 20 May 2003 05:07:12 -0600 (MDT)
From: John Barentine
Subject: 3.5m Night Log 20030519
                         Apache Point Observatory
                         3.5m Telescope Night Log
                           Monday, May 19, 2003
                                                          ACTUAL
 ASTRONOMER     OBSERVER(S)             INSTRUMENT     START FINISH
 --------------------------------------------------------------------
 J.Frieman      J.Gaskins               DIS            --:--  --:--
 G.Wallerstein  V.Woolf                 Echelle        --:--  --:--
   INST        SCHEDULED     WEATH     EQUIP     OBS     DAY  NOTUSED
 I/RO/DN     START FINISH   D    B    D    B    D    B   USE   D    B
 --------------------------------------------------------------------
 UC03/R      20:59  01:00  3.3  0.7   0    0    0    0    0    0    0
 UW09/R      01:00  05:01   0   4.0   0    0    0    0    0    0    0
 note: scheduled times listed include instrument change time
                ------------- ACTIVITY LOG --------------
 Observing Specialist: J.Barentine
 Increasing clouds, winds and dust around sunset prevented us from
opening.  In the next several hours, as a dry line advanced over southern
central New Mexico, the clouds dissipated but the winds kept up, dust
fluctuated and humidity began to rise.  Shortly after midnight, Jenny gave
up on my feeling that the weather picture was not likely to improve within
the next hour.  At that time the humidity was pegged at 92%, and we were
still experiencing wind gusts to 40 MPH, although the dust had started to
drop.  The situation degraded after about 00:30, the humidity popping up
to 100%.  Vincent threw in the towel at 04:15.
                        ------- 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
 ---------------------------------------------------------------------
               --------------- WEATHER LOG ----------------
                                 Wind                        Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
     ------------------------------------------------------------------
     16:01    73    27      8   215  (SW)     760  MstlyClr    none
     17:01    71    24      9   224  (SW)     736  MstlyClr    none
     18:01    71    25     16   216  (SW)     614  PtlyCldy    none
     19:01    67    22      8   207  (SSW)    693  PtlyCldy    none
     20:01    57    41     20    86  (E)     2877  MstlyCldy   none
     21:01    52    42     19    85  (E)     3125  PtlyCldy    none
     22:01    50    42     33    73  (ENE)   2618  MstlyClr    none
     23:01    47    42     27    68  (ENE)   1944  MstlyClr    none
     00:01    45    42     29    69  (ENE)   1582   Clear      none
     01:01    43    43     33    76  (ENE)   1137   Clear      none
     02:01    42    42     34    70  (ENE)   2077   Clear      none
     03:01    40    41     24    66  (ENE)   2612   Clear      none
     04:01    39    39     29    75  (ENE)   1381   Clear      none
     05:01    38    38     36    72  (ENE)    517   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: 2.85b
   Current guide software version: GIm Ctrlv4.1b4
   Current TCC version: 2.6.8  Current TUI version: 0.66