Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini (Mau_Bard)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: NGC 2395 · PGC 139019 · PGC 1420191 · PGC 1420282 · PGC 1420816 · PGC 1421175 · PGC 1421399 · PGC 1421404 · PGC 1421568 · PGC 1421653 · PGC 1422135 · PGC 1422206 · PGC 1422431 · PGC 1422894 · PGC 1424362 · PGC 1425279 · PGC 1426182 · PGC 1428980 · PGC 1429651 · PGC 1432041 · PGC 1435465 · PGC 1435525 · PGC 1435645 · PGC 1435767 · PGC 1436375 · PGC 1437381 · PGC 1439921 · PGC 21179 · PGC 21186 · PGC 21197 · And 2 more.

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Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini

Powered byPixInsight

Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini

I collected the data during on the nights of 19-20-21-22 March 2022, from my suburban Bortle 7 (+ moon) terrace with a color camera and a dual band Ha-OIII filter. I decided not to play too much with the colors, choosing not to swap or create synthetic channels, to make the two original bands clearly visible. Processing with PixInsight was probably the longest I ever did. I expected to become faster with the experience, and in fact what happens is exactly the contrary.

In the picture are visible two main objects, plus several far galaxies in the background.

Abell 21 (Medusa Nebula, PK205+14.1, Sharpless 2-274)
It was discovered in 1955 by George O. Abell, who classified it as an old planetary nebula. Soviet astronomers confirmed in 1971 that the original classification was correct. As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported.
In the image here are visible the filaments in the body of the nebula. It is circa 1500 ly away from us.

NGC 2395 (Herschel 98 ) Open cluster
It is estimated to be 1700 lx distant and 6 ly wide. It contains 20 stars.

Light Polluted skies
ZWO ASI 2600MC PRO
Abell Planetary Nebula
Imaged with N.I.N.A.
N.I.N.A. Users
Imagers of Italy
Musical Imagers
Narrowband imaging
Optolong L-eXtreme filter
Suburban Astrophotography
PixInsight Addicts
Sharpless2 Objects
Planetary Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	5615157
PixInsight job	0ETF4DRLE6H29HH99D595F6TN7FQWU1G
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h28m52s.485
RA (top/left)	07h26m11s.995
RA (top/right)	07h31m30s.465
RA (bottom/right)	07h31m33s.659
RA (bottom/left)	07h26m14s.111

Dec (center)	+13°24′32″.50
Dec (top/left)	+12°59′06″.24
Dec (top/right)	+12°58′09″.76
Dec (bottom/right)	+13°49′52″.49
Dec (bottom/left)	+13°50′47″.39

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Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini

Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini

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Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini

Abell 21 Medusa Nebula PK205+14.1 and Open Cluster NGC 2395 in Gemini

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