Abell 21 (Sh2-274) - Medusa Nebula (HOO) (Roman Pearah)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: NGC 2395 · PK205+14.1 · Sh2-274

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Abell 21 (Sh2-274) - Medusa Nebula (HOO)

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Abell 21 (Sh2-274) - Medusa Nebula (HOO)

Starting with a "scientific" SPCC-calibrated baseline, the R/G/B channels were adjusted to have varying blends of the calibrated Ha and OIII depending on the strength of one over the other, with the resulting HSO-adjacent palette. A similar but slightly different result was achieved before by Frank Breslawski but I think the initial calibration led to a different outcome. The stars still reflect the calibrated baseline. I normally like to do RGB stars but I really wanted to show the capability of SPCC's narrowband calibration and I think the result is nice. I didn't want to push the data too hard but I did manage to bring out a bit of the Ha "umbilical cord" that links up to the Ha cradling the main nebula. This is not a context one often sees in images of Abell 21, so I really wanted to at least make it visible, if only slightly. With additional time, I think it could be even more prominent.

Imaged with N.I.N.A.
Takahashi Epsilons
Losmandy mounts
QHY268M/ZWO2600M Images
Abell Planetary Nebula

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Status	Advanced success
Started	...
Astrometry.net job	6851021
PixInsight job	L9CXFR3UEUYVYLNHB2XKTPQRBCGS9QMS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h28m47s.894
RA (top/left)	07h26m41s.121
RA (top/right)	07h30m54s.153
RA (bottom/right)	07h30m55s.700
RA (bottom/left)	07h26m41s.296

Dec (center)	+13°19′33″.83
Dec (top/left)	+12°59′41″.42
Dec (top/right)	+12°59′29″.49
Dec (bottom/right)	+13°39′22″.85
Dec (bottom/left)	+13°39′34″.70

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Abell 21 (Sh2-274) - Medusa Nebula (HOO)

Abell 21 (Sh2-274) - Medusa Nebula (HOO)

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Abell 21 (Sh2-274) - Medusa Nebula (HOO)

Abell 21 (Sh2-274) - Medusa Nebula (HOO)

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