[AZ-Observing] Re: Comet C2012 S1 (ISON)
- From: "Bernard Miller" <bgmiller011@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sat, 16 Nov 2013 18:03:15 -0700
Howard,
I just saw this. Very nice job.
Bernard
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Howard Anderson
Sent: Wednesday, November 13, 2013 2:03 PM
To: EVAC ONLINE; az-obs
Subject: [AZ-Observing] Comet C2012 S1 (ISON)
Hi,
After prodigious amounts of processing partly due to following many
dead-ends, I finally arrived at a comet image I can almost live with. :-)
It is at http://www.astroshow.com/Comets/2012S1ISON2.html
This comet is rather difficult at the moment because it is low in the
Eastern sky and dawn breaks pretty soon after it is high enough to capture
it.
Had L,R,G, and B images with a fair amount of noise. Got 5 each L, R, G,
and B unguided 1 minute exposures at Bin 4. Combined images in accordance
with instructions in the Dec 2013 issues of Sky & Telescope article by Chris
Cook, "Capturing Comets." His Photoshop techniques allow one to get the
comet AND the stars WITHOUT star trails!
Since the comet was moving at almost 6 arc-minutes per hour, the star trails
would have been significant. (They were significant until I applied the
Photoshop techniques in Chris' article!)
So this was my last chance on this comet because it is now too low in the
sky for me to shoot it before twilight becomes a problem.
My observatory wall in the East direction requires due-East objects to be
above 23 Degrees altitude. (North-South directions allow me to shoot down
to the horizon... But East and West directions have some
limitations.)
Thanks,
Howard
http://www.astroshow.com
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