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Re: [OM] More fun with comets

Subject: Re: [OM] More fun with comets
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Wed, 22 Jul 2020 09:24:25 -0700
At 7/19/2020 10:22 PM, Peter wrote:

>Here's my best set from last night's comet hunt.
>
>This shot will show you what I was up against. My chosen site had a great 
>view, but the old sewage treatment plant, now converted to a pumping station, 
>was lighting up the sky.
><https://www.flickr.com/photos/24844563@N04/50131046763/in/dateposted-public/>
>
>I was able to make a bit of lemonade out of that lemon, though:
><https://www.flickr.com/photos/24844563@N04/50131834767/in/dateposted-public/>
>
>I got lucky on this one, a satellite track "chopping" off the comet's tail:
><https://www.flickr.com/photos/24844563@N04/50131045688/in/photostream/>
>
><https://www.flickr.com/photos/24844563@N04/50131609141/in/photostream/>
><https://www.flickr.com/photos/24844563@N04/50128829231/in/photostream/>
>
>This is pushing the limit of enlargement.
><https://www.flickr.com/photos/24844563@N04/50131044783/in/photostream/>
>
>8 second exposures do elongate the stars slightly, for those of us not blessed 
>with equatorial mount.  But Focus Magic software has a motion blur correction 
>feature that fixes that quite nicely.  I used it on some of these.
>
>View large by pressing "L."Â  Or click on any picture, once to magnify, again 
>to magnify even more, and again to go back to the original display.

I have not even attempted, as I'm sure there is someone on the web who will do 
better than me.

Supposedly the Pentax K-1 has Astrotrack. Using GPS and sensor shift, can track 
for a certain period of time. Equatorial mount requires a lot of aligning and 
clock drive. I suspect there are good systems today. I just remember, back in 
the 60s when my friend (now astronomer) and I built a telescope with clock 
drive, how much was involved in setting it up. Of course, he was looking for 
very long exposures. Then there was the spotter scope tracking... The 
Astrotrack feature sounds interesting for short duration.

WayneS
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