Date: Wed, 15 Sep 2004 09:35:47 -0600
From: Dan Long
Subject: Re: 2.5m obslog 20040914 (MJD 53263)
>                        APACHE POINT OBSERVATORY SDSS 2.5M
>
>                                  OBSERVING LOG
>                            Tuesday September 14, 2004
>
>                                   (MJD 53263)
>
>Run 4829: 1260 S, starting mu = 25.5.  Everything good from the beginning.
>Seeing went from good to acceptable around frame 329, mu = 74.  Just as
>we were about to end the drift, the telescope stopped tracking.  See the
>Problems section for details.  This ruined the last 2 frames of the drift.
>The last good frame of the drift was 343, mu = 76.
This was due to the azimuth axis hitting its negative software limit
of -150 degrees.  An interesting aside.  The TCC reacts to hitting a
limit by unwrapping the axis in the next update.  In this case it
caused the rotator to abort as well because of the impossibly large
move requested.
2004-09-15 11:31:36.885Z 0 0 I TCCStatus="TTT","NNN";
TCCPos=-149.97,54.79,-111.44; AxePos=-149.97,54.79,-111.44
2004-09-15 11:31:36.977Z 0 0 I AxisErrCode="OK","OK","OK"
2004-09-15 11:31:36.978Z 0 0 I CurrArcOff = 5.631363, 0.000464,
4601964735.45000, 50.426124, 0.004153, 4601964735.45000
2004-09-15 11:31:36.979Z 0 0 I ObjNetPos = 26.896907, 0.001782,
4601964735.45000, 59.549189, 0.004081, 4601964735.45000
2004-09-15 11:31:36.980Z 0 0 I ObjInstAng = 12.479224, 0.001536,
4601964735.45000
2004-09-15 11:31:36.981Z 0 0 I SpiderInstAng = -111.214889,
-0.000237, 4601964735.45000
2004-09-15 11:31:39.545Z 0 0 W AzPosRejected=209.98, -150.00, 390.00
2004-09-15 11:31:39.884Z 0 0 I TrackAdvTime=3.67
2004-09-15 11:31:39.977Z 0 0 W Text="tracking failed on one ore more
axes"; AxisNoTrack="TFT"; AxisErr="MinPos","OK","CannotCompute"
2004-09-15 11:31:44.723Z 0 0 I TrackAdvTime=3.83
2004-09-15 11:31:46.885Z 0 0 I TCCStatus="HTH","NNN";
TCCPos=NaN,54.76,NaN; AxePos=-149.98,54.76,-111.44
2004-09-15 11:31:46.978Z 0 0 W AxisErrCode="MinPos","OK","CannotCompute"
			Cheers,
			  Dan