[APML] Comet 73P/Schwassmann-Wachmann in 2006

["Thomas W. Earle" <twade@bmi.net>]

Since a clear night seems futile during the window to photograph
Comet Machholz, I'm starting to prepare for the next known visual
comet, Comet 73P/Schwassmann-Wachmann in 2006.  This particular
rendezvous with the sun will place it very close to the Earth in
May.  In fact, it will be closer than Comet Hyakutake at
approximately 4.7 million miles on May 17.  It will be trekking
across the sky at an unbelievable 30.6"/minute.  This will make it a
challenge to photography, especially if you want pinpoint stars.
I'm just hoping my STV can track something that fast.  Given its
speed, you only have about 2 minutes with a 75 mm lens before
trailing of the stars becomes noticeable if you are guiding on the
comet so fast film will be a must.  Because of its fast speed,
CCDers will have better luck with this comet; however, I'm going to
do my best assuming I get a clear sky.  What's really interesting is
the "predicted" ion tail length of about 85 degrees on May 21, using
Comet for Windows.  Fortunately, the comet has slowed down
considerably by this time, 13.6"/minute.  This should be a sweet
sight if it truly pans out this way; however, as all of you know,
comets are very unpredictable.  Nonetheless, I'm looking forward to
its visit since the persistent low/trough off the West Coast appears
to have found a home.

Wade


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