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OT: new plasma arch around andromeda imaged
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Following up a thread here from a while ago discussing the hydrogen clouds around Andromeda, a new plasma arch has been imaged. the pictures of the galaxy and surrounding areas are astonishing. a short video presentation (english, other languages available) https://www.youtube.com/watch?v=TEMXss1Qo4E Brian Brian Valente astro portfolio https://www.brianvalentephotography.com/astrophotography/ portfolio brianvalentephotography.com |
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dan kowall
Totally gobsmacked.
What an astonishing discovery. dan kowall photonhunter.com |
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Luca Marinelli
Thank you for posting that, Brian.
I have been attempting to image one of the Drechsler-Strottner objects and while I am no stranger to imaging very faint DSO, this is a completely different ballgame. I have collected 200 hours of narrowband data with a 10in f/3.8 newt and I can
barely make out the outline of the PN.
It’s difficult to comprehend how Marcel and collaborators are combining their nose for new signal with incredible image processing talent to extract these ridiculously faint signatures.
Cheers,
Luca
On Jan 9, 2023, at 12:24 PM, dan kowall via groups.io <daniel.a@...> wrote:
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200 hours? I would have to make 36 trips out to my remote site to accumulate that much imaging time. :-)
Good luck on your project. -- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ |
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My personal feeling is that Marcel is likely one of the best processors of image data that there is. Not only is he able to pull out very faint nebulosity, but it's always well defined and very smooth. No degradation in the quality of the data. He will occasionally reveal bits of his processing technique when explaining how they came to conclusions on their research. In this case he said they used some subtraction technique to reveal the OIII. I'm wondering if he subtracts known parts of the image leaving a clear representation of the new content somehow. I'm always surprised by the results, and I hope one day he reveals all his techniques so that others can learn from him.
Regards, Andrew |
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dvjbaja
Most likely a continuum subtraction in the OIII data would remove stars, and isolate the OIII pretty well from the broadband glow from m31 and the sky background. In the sample OIII image, the stars were put back. The OIII exposure set was under 50 hours. That's fairly easy to do with a remote system and a lot of clear nights. It adds up fast. 3nm bandpass allows for a lot of work to be done on moonlit nights as well. And it was done with the paltry FSQ and a relatively low cost 2600mm camera. If there ever was a candidate for amateur astrophoto of the year, this is the one. |
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