Abell 31 | SH2-290 (Kevin Morefield)

Celestial hemisphere: Northern · Constellation: Cancer (Cnc) · Contains: PK219+31.1 · Sh2-290

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Abell 31 | SH2-290

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Abell 31 | SH2-290

One of the largest Planetary Nebulae in the sky, Abell 31 is also quite dim. Age expands and dims these objects and this is described as "ancient" though I found no absolute age.

This image an HOO in color but luminance is HO 50/50. Without adding a separate Luminance I find that the O channel is to over represented. This leads to excess noise as the O is usually the weakest.

There's really not much that processing adds to this object. It's quite diffused and seems to lack sharp features - which was a good fit for turbulent Winter skies. The big challenge is noise reduction and dealing with banding artifacts since the signal is so close to the noise floor everywhere except the primary nebulosity.

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Description: Contrast

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Abell Planetary Nebula
QHY Users Group
Narrowband imaging
Sharpless2 Objects

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Status	Advanced success
Started	...
Astrometry.net job	4192139
PixInsight job	09G7WPAX0CWQIHOLN6OS0DSFWL7ZHUEY
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	08h54m14s.660
RA (top/left)	08h55m54s.339
RA (top/right)	08h54m07s.765
RA (bottom/right)	08h52m34s.939
RA (bottom/left)	08h54m21s.507

Dec (center)	+08°52′25″.37
Dec (top/left)	+08°45′44″.00
Dec (top/right)	+09°17′53″.29
Dec (bottom/right)	+08°59′05″.28
Dec (bottom/left)	+08°26′59″.15

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Abell 31 | SH2-290

Abell 31 | SH2-290

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Abell 31 | SH2-290

Abell 31 | SH2-290

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