Abell 21, The Medusa Nebula in HOO
- umasscrew39
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Abell 21, The Medusa Nebula in HOO
Following many frustrating evenings of poor weather, I at least gathered enough data to come up with an image of this planetary nebula. The Medusa (Abell 21), discovered relatively recently in 1955 by University of California astronomer George O. Abell, classified it as an old planetary nebula. The nebula is large but its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. Thus, it can be a challenge under Bortle 6 skies, especially with a lot of "below average seeing" nights which is what you are viewing here. I tried various HOO combinations with PixelMath to bring more of the OIII out but was not that successful.
Bruce
Astronomy? Impossible to understand and madness to investigate........Sophocles, c. 420 BCE
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Re: Abell 21, The Medusa Nebula in HOO
Unusual subject and you picked a hard one, lovely remnant - thanks for sharing.
Cheers,
Tony.
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Tony.
Smart Scope: Dwarf II - Club and outreach work.
AP Refractor: Altair 72EDF Deluxe F6;1x & 0.8 Flatteners; Antares Versascope 60mm finder. ASIAir Pro.Li battery pack for grab & go.
Celestron AVX Mount; X-cel LX eyepieces & Barlows 2x 3x, ZWO 2” Filter holder,
Cameras: main DSO ASI533MC; DSO guide ASI120MM; Planetary ASI224MC; DSLR Canon EOS100 stock.
Filters: Astronomik IR cut; Optolong L-Pro; Optolong L-Enhance.
Binoculars: Celestron 15 x 70.
Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447
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Re: Abell 21, The Medusa Nebula in HOO
Wonderful image! Great work!
Marius
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Re: Abell 21, The Medusa Nebula in HOO
Great looking image Bruce.
Jim Thommes
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Re: Abell 21, The Medusa Nebula in HOO
Lookin' Good Bruce!
Very nice
Very nice
Clear Skies,
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Re: Abell 21, The Medusa Nebula in HOO
well done , thx
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Re: Abell 21, The Medusa Nebula in HOO
Pretty image Bruce. That may be the dimmest nebula I've seen presented here (maybe the Squid?).
The link below is to a tutorial to help bring out the blue in NB images. Maybe it will help?
https://www.youtube.com/watch?v=5M3zB7-Llhw
Good luck.
Steve
The link below is to a tutorial to help bring out the blue in NB images. Maybe it will help?
https://www.youtube.com/watch?v=5M3zB7-Llhw
Good luck.
Steve
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Re: Abell 21, The Medusa Nebula in HOO
Such a beautiful image of a very difficult target.
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Re: Abell 21, The Medusa Nebula in HOO
Thanks to all for the compliments. This was indeed a tough challenge, especially given underwhelming amount of good seeing for the OIII data in addition to the nature of the nebula itself being extremely dull. That also probably explains the lack of folks imaging it but it was fun to to do despite the nightly hair-pulling!
Steve- thanks for the video. I tried it and it was a slight improvement but I think the OIII data is just overwhelmed byHa . I will surely try it on other DSOs .
Steve- thanks for the video. I tried it and it was a slight improvement but I think the OIII data is just overwhelmed by
Bruce
Astronomy? Impossible to understand and madness to investigate........Sophocles, c. 420 BCE
StarzantiSkies Observatory
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Astronomy? Impossible to understand and madness to investigate........Sophocles, c. 420 BCE
StarzantiSkies Observatory
https://www.astrobin.com/users/umasscrew39/
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Re: Abell 21, The Medusa Nebula in HOO
Amazing work on this image Bruce. Beautiful job!
Jim
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Re: Abell 21, The Medusa Nebula in HOO
Beautiful image and, as has been mentioned, a tough target. Very well done
Arry (Bortle 7 area)
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Re: Abell 21, The Medusa Nebula in HOO
Excellent capture on this dim target!
Alex
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