From ops@s2mass.ctio.noao.edu Mon Mar 30 08:20:59 1998
Date: Mon, 30 Mar 1998 11:19:41 GMT
From: 2MASS Operations Manager <ops@s2mass.ctio.noao.edu>
To: skrutski@north.phast.umass.edu, stiening@cannon.phast.umass.edu,
    ehwd@kutath.phast.umass.edu, osaa@ctios1.ctio.noao.edu,
    gbrehmer@ctios1.ctio.noao.edu, roc@ipac.caltech.edu,
    davy@ipac.caltech.edu, gizis@stratford.phast.umass.edu


2MASS South Observing Log for Night 395  (03/30/98  UT)

Observer: E. Howard

Weather Conditions: before sunset: partly cloudy
                    23:22: partly cloudy
                    02:05: still clouds to the west and north, but it
                           looks better
                    02:36: clouds to the west, north, and east, but
                           looks better overhead
                    06:29: sky looks better, clouds still present to
                           the south.
                    07:08: clouds to the south-east, but otherwise clear
                    07:42: clouds lower to the south-east. Rest of the
                           sky is clear
                    09:16: other than some clouds low on the southern
                           horizon, it's clear
                    10:06: some small patches of cirrus is visable, 
                           now that the sky is bright

Moon phase: waxing crescent

Eyeball quality estimates: before sunset: not photometric
                           23:22: not photometric
                           02:05: likely not photometric
                           02:36: likely not photometric
                           04:35: not photometric
                           06:29: possibly photometric
                           07:08: possibly photometric
                           07:42: probably photometric
                           09:16: photometric
                           10:08: likely not photometric
Notes:

GMT   Scan    Comment
22:30         opened dome, turned on fan, filled dewar (3min) cts=-190 (all)
22:47         tt=22.6 focus=936
23:22         tt=20.9 ht=19.0 at=18.9 humid=22
02:07 001     likely not photometric, but it looks much better, so try
              for a standard  
              tt=17.9 ht=16.2 at=17.0 humid=29 bkg=460,2190,4030
              Nope, k-band variations - clouds. Abort scan.    
02:37 001     try again. tt=17.4 ht=15.3 at=17.3 humid=28
              bkg=425,2270.3300
              Nope, k-band variations again, abort scan.
04:31 001     try yet again tt=17.2 ht=16.0 at=17.7 humid=26
              Nope, still clouds.
06:30 001     Try yet again, tt=16.7 ht=15.8 at=17.33 humid=25
              bkg=245,930,2410; H bkg is much lower. K-bkg looks
              stable.
06:38 007     tt=16.8 ht=15.7 at=17.2 humid=25 bkg=240,940,2370
07:14 012     tt=16.7 bkg=260,1020,2420
07:24 014     tt=16.6 ht=15.2 at=17.1 humid=25 bkg=380,1690,2870
              high airmass std.
07:43 020     tt=16.7 bkg=250,970,2385
08:06 023     tt=16.6 bkg=300,1180,2500
08:31 032     tt=16.5 bkg=300,1200,2480
09:11 037     tt=16.5 bkg=320,1380,2540
09:23 044     tt=16.5 bkg=300,1290,2490
10:05 050     tt=16.4 ht=14.9 at=16.4 humid=27 bkg=360,1575,2580
10:20 056     twiligh tt=16.3 at=16.2 humid=27
10:57         starting fill dewar
11:00         dewar full
11:03         ct= -190 all
11:05 060     dark
11:17         tapes Non-compressed