Medusa Nebula (Abell 21) - HSO + RGB Stars (Medusa Nebula (Abell 21) - HOO + RGB Stars) (Meeps51)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: PK205+14.1 · Sh2-274

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Medusa Nebula (Abell 21) - HSO + RGB Stars (Medusa Nebula (Abell 21) - HOO + RGB Stars)

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Medusa Nebula (Abell 21) - HSO + RGB Stars (Medusa Nebula (Abell 21) - HOO + RGB Stars)

It's been a journey to get the CDK17 + ASI461 up and going. Abell 21 was a perfect target to stretch it's legs and I was excited with this outcome even if I only got a few hours of data. Similar to M97, I spent a few weeks thinking my RGB filters were narrowband only to realize I'd loaded them in the wrong order and then switched to actual Narrowband (HSO) imaging. Because of this, and a lot of crappy nights/trial and error, even with almost of a month of work (March 10, 2024 thru April 12, 2024) we got ~2hrs of data.

I ended up liking the simpler HOO w/ RGB stars combo (vs. SHO / Hubbell Palette) and marked that as final. If you look at her for long enough, you can see her grinning back with both ears up! Or is this upside down and her bigger mass should be on top to be the snakes on her head?

Next year I'll revisit this cool Nebula and see if I can pick-up a lot more detail with a NB focused regimen of data.

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Title: Medusa Nebula (Abell 21) - SHO + RGB Stars

Description: Original version that had the SII data as well. I couldn't get it to really pop on the left side (you can barely see a hint of the red if you zoom in), so decided to stick with the HOO version!

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Nebula
Remote Observatory - New Mexico

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Status	Advanced success
Started	...
Astrometry.net job	9663383
PixInsight job	VAW7LS5Z9BGH5B7TKR8FET6JPKXIPHTP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h28m45s.870
RA (top/left)	07h28m10s.653
RA (top/right)	07h27m33s.682
RA (bottom/right)	07h29m21s.105
RA (bottom/left)	07h29m58s.187

Dec (center)	+13°16′25″.30
Dec (top/left)	+13°32′20″.60
Dec (top/right)	+13°12′07″.47
Dec (bottom/right)	+13°00′28″.38
Dec (bottom/left)	+13°20′40″.97

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Medusa Nebula (Abell 21) - HSO + RGB Stars (Medusa Nebula (Abell 21) - HOO + RGB Stars)

Medusa Nebula (Abell 21) - HSO + RGB Stars (Medusa Nebula (Abell 21) - HOO + RGB Stars)

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Medusa Nebula (Abell 21) - HSO + RGB Stars (Medusa Nebula (Abell 21) - HOO + RGB Stars)

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