Medusa Nebula (Abell 21, SH2-274, Narrowband) - V2 (Eduardo Suárez)

Medusa Nebula (Abell 21, SH2-274, Narrowband) - V2

Revision title: SHO (2 days acquisition data, cropped)

UPDATE 27/02/2024, New version with 2 days combined acquisition data:

I got a small window of clear(ish) skies on the 24th February evening, so I got the FLT132 out to image the Medusa Nebula in narrowband (with Optolong L-Ultimate). I'm pleased with the results, bearing in mind it was a bit cloudy and with a full moon. I managed to get a second night out on this target, on the 26th Feb, with 2 more hours using the Optolong L'Ultimate and 2 hours with the Antlia Triband RGB Ultra. I'll upload two versions, one in HOO red hues as per original colours from the 2600MC Pro camera and another in simulated SHO/Hubble palette.

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The Medusa Nebula (SH2-274) is a large planetary nebula located 1,500 light-years away in the constellation Gemini. With an apparent magnitude of 15.99, the nebula is a challenging target for amateur telescopes. It occupies an area 10.25 arcminutes across and has a physical diameter of about 4 light-years. The stellar core of the Medusa Nebula is a PG 1159 star, transitioning from being the central star in the planetary nebula to being a hot white dwarf. PG 1159 stars are pre-degenerate stars with hydrogen-deficient atmospheres and surface temperatures between 75,000 K and 200,000 K.

The Medusa Nebula was discovered by the American astronomer George O. Abell in 1955. Abell classified the object as an old planetary nebula. The Medusa is also known by the catalogue designation Abell 21 from the Abell Catalog of Planetary Nebulae (1966) and Sharpless 2-274, from the Sharpless catalogue of H II regions. The Medusa Nebula was believed to be a supernova remnant until the 1970s.
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Thanks for looking.

Clear skies
Eduardo

Original
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Final
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Title: HOO (2 days acquisition data)

Description: This version is the combined integration time over two days and over 7 hours.

Uploaded: ...

G

Title: SHO (2 days acquisition data, cropped)

Description: Two days acquisition data in SHO colour palette and cropped to highlight the nebula

Uploaded: ...

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Medusa Nebula (Abell 21, SH2-274, Narrowband) - V2

Revision title: SHO (2 days acquisition data, cropped)

Medusa Nebula (Abell 21, SH2-274, Narrowband) - V2

Revision title: SHO (2 days acquisition data, cropped)

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Medusa Nebula (Abell 21, SH2-274, Narrowband) - V2

Revision title: SHO (2 days acquisition data, cropped)

Medusa Nebula (Abell 21, SH2-274, Narrowband) - V2

Revision title: SHO (2 days acquisition data, cropped)

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