Date: Sat, 18 Jun 2011 11:19:16 -0000 (UTC)
Subject: 3.5m Night Log 20110617
From: "Gabrelle Saurage"
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Friday, June 17, 2011
                                                           ACTUAL
 ASTRONOMER      OBSERVER(S)            INSTRUMENT     START  FINISH
--------------------------------------------------------------------
M.McElwain        M.McElwain            Echelle        20:30   01:00
A.McKay           A.McKay               ECHELLE        01:00   05:20
   INST       SCHEDULED     WEATH     EQUIP      OBS     NOT USED
 I/ROW/DN   START  FINISH   D    B    D    B    D    B    D    B
 ----------------------------------------------------------------
PU03/R     20:22   01:10    0    0   1.5  1.2   0   3.3   0    0
NM04/R     01:10   05:46    0    0    0    0   0.0  4.6   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: G.Saurage
As soon as we got on sky we discovered a problem. I could not get stars on echelle
or even NA2 guider. All covers open, everything pointed at the right port etc. Since
there was loss of utility power during the day and the generator did not kick on
right away, the shop air had gone down. Bill suggested I might need to home E axis.
I did that but didn't help. I tried homing all the tert axes, looking through the
NA2 port at bright stars. Nothing was making sense. I was getting no errors at all
but no stars either. Eventually we discovered the alt drive was not making
corrections, and the telescope thought it was ~6.3 degrees off in Alt from what it
should be (The 45 degree magnasensor was at 38.7 degrees). I reset the position by
visually looking at the magnasensors and then final got on sky at 11 pm.
Rest of the night went smooth except for clouds.
                    ------- FAILURE LOG -------
PROG   INST   FAILURE MODE     TIME
    (SEDFNVOG)   TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
PU03    E         T/H/     20:30  23:10   alt magnesensors lost
            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 22:58 ECHELLE   353( -458) 276  30  17.7 17.5 17.8 17.4 17.5     1.81
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    76    30     15   259    (W)    702  ptly cldy   none
     17:00    73    28     14   267    (W)    656  ptly cldy   none
     18:00    71    27     18   250  (WSW)   1189  ptly cldy   none
     19:00    68    25     18   260    (W)   1804  ptly cldy   none
     20:00    66    25     22   254  (WSW)   1357  ptly cldy   none
     21:00    65    25     24   266    (W)   1663  ptly cldy   none
     22:00    64    24     25   265    (W)   1617  ptly cldy   none
     23:00    63    24     18   263    (W)   1387  ptly cldy   none
     00:00    63    24     18   273    (W)   1316  ptly cldy   none
     01:00    63    24     16   289  (WNW)   1255 mstly cldy   none
     02:00    63    24     14   297  (WNW)   1306 mstly cldy   none
     03:00    62    24     12   297  (WNW)   1181 mstly clr    none
     04:00    61    25     15   298  (WNW)   1167 mstly clr    none
     05:00    61    25     13   290  (WNW)   1305    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
    Telescope drives operational. Current TCC version: 2.14.0
    Current TUI version: 1.8.7