Abell 21 (Medusa Nebula) in HOO (Bruce Donzanti)

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

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Abell 21 (Medusa Nebula) in HOO

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Abell 21 (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.

Light Polluted skies
Planetary Nebulae
Abell Planetary Nebula
ZWO ASI 2600MC PRO
Narrowband imaging
Schmidt-Cassegrain Telescope (SCT) Imagers

C11" EdgeHD

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Status	Advanced success
Started	...
Astrometry.net job	4390261
PixInsight job	BOJD1FA4XBHK8IOQOF52R3W62IYNEEBS
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	07h29m04s.234
RA (top/left)	07h29m18s.112
RA (top/right)	07h30m02s.523
RA (bottom/right)	07h28m50s.339
RA (bottom/left)	07h28m05s.951

Dec (center)	+13°14′33″.60
Dec (top/left)	+13°00′43″.86
Dec (top/right)	+13°15′38″.11
Dec (bottom/right)	+13°28′22″.12
Dec (bottom/left)	+13°13′27″.19

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Abell 21 (Medusa Nebula) in HOO

Abell 21 (Medusa Nebula) in HOO

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Abell 21 (Medusa Nebula) in HOO

Abell 21 (Medusa Nebula) in HOO

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