Right on! ("North up, east left, as should be the case in every image!").
Happy New Year,
Bill
-----Original Message-----
From: Tom Polakis <tpolakis@xxxxxxx>
To: AZ-Observing <AZ-Observing@xxxxxxxxxxxxx>
Sent: Fri, Jan 1, 2016 3:25 pm
Subject: [AZ-Observing] Comet C/2013 US10 (Catalina): Six Images Taken During
December
This is a sequence of six frames taken on different mornings in December,
mostly at around 12h UT.
http://www.pbase.com/polakis/image/162235446/original
Images are all 5-minute exposures taken with an SBIG ST-6303 camera on a
12.5-inch Dall-Kirkham telescope at f/6.7. Native image scale was 0.88
arcsec/pixel, but it has been down-sampled 25% to 3.5 arcsec/pixel. North up,
east left, as should be the case in every image! The site is my backyard in
Tempe, where the limiting magnitude is roughly 4.5.
Variations in the ion tail are significant over such a large time span, but I
found changes in the downward-pointing anomalous tail morphology much more
interesting.
For what it's worth, I also created this version using the same data, but with
cross-fades between the images. It smooths things out, but results in bogus
interpolations in tail structure.
http://www.pbase.com/polakis/image/162236047/original
Tom
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