Date: Sat, 18 Sep 1999 04:56:16 -0600
From: Dan Long
Subject: 2.5m obslog 990917 ( MJD 51439 )
                          FRIDAY SEPTEMBER 17, 1999
                      APACHE POINT OBSERVATORY SDSS 2.5m
                               OBSERVING  LOG
     Observering team:   Dan Long                (APO)
			Stephanie Snedden	(APO)
			Scot Kleinman		(APO)
			Scott Burles		(UC)
    Tonight's plan was to obtain as much spectrographic data the night
would allow.  Instead it was astronomical water torture... clear
skies and everything dripping wet with condensing humidity.  We never
opened.
    Plate 202 on cartridge 4 is still on the telescope.
    The imager was turned off tonight and allowed to warm up.  The key
for the power switch was left in the switch.
                                 MIRROR NUMBERS
    Primary:
    setmir:  0  -7.8   7.8   427   427
    galil:   5100, -2700,  200, -6050,  7300,  7000
    linear gauges
  1 = 1.9310
  2 = 0.5575
  3 = 0.5565
  5 = 1.9060
  6 = 0.4070
  4 = 0.2630
  7 = -6.8700
  8 = -0.2910
    Secondary: ( inst=spectro focus=1400 alt=18 deg )
    setmir:  1400  -0.2  25  0  98.4
    galil:   1721246, 1806011, 1764192,  -8431, -6962
    TPM data was logged for most of the night using the "start
tpm51439.dat" command.
    Nitrogen notes:  Both spectrographs were filled at 18:00 and again
at about 05:00.  The 180 L dewar for the imager was disconnected at
about 22:30.  It is still about a third full and will be left at the
telescope for use filling the spectrographs.
                                 WEATHER
    Weather tonight was mostly clear at sunset and remained clear or
mostly clear until about 04:00 when it became foggy.  There was
condensing humidity all night long ( dewpoint depression -0.1 to 2.2
C ), the remnants of the long soaking rain we had all day.
Temperatures were in the mid 40s most of the night.  Winds were out
of the S at less than 10 MPH most of the night.  Seeing tonight was
not measured.
                                   Dan