Pickering's Triangle (NGC 6979) (Joel Shepherd)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Sh2-103

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Pickering's Triangle (NGC 6979)

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Pickering's Triangle (NGC 6979)

This was on my short list of targets for this summer. I was expecting to use the Hubble palette (SHO) but wasn't happy with the results. So, although it might be sacrilegious, I went with a simple HSO combination instead. It seems to highlight the pure Ha and pure O-III areas nicely, without allowing the Ha to overwhelm the results as it seems to with an SHO combination.

Original
B
Final
C

B

Description: Reprocessed end-to-end. My original darks had issues (double-subtracted bias?). Also combined all the lights into a low-noise luminance and used that for detail. Palette is a "tri-color": Ha & S-ii for red, Ha & O-iii for green and slightly strengthened O-iii for blue. Might be a touch too intense, but I'm happier with what (to my eye anyway) seems to be richer nebulosity. The first version struck me as anemic.

Uploaded: ...

C

Description: One last pass: trying to soften the transitions. This time I closely followed the translation of J.P. Metsavainio's tone-mapping technique described here: L'arciere Celeste which led to cleaner star removal and a more nuanced luminance image. Also cropped differently to give the triangle some room to breathe.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	1343305
PixInsight job	IZYAAH3KYFU2XBN61FT0WOM009MGWWFC
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h48m44s.67
RA (top/left)	20h44m41s.61
RA (top/right)	20h49m28s.53
RA (bottom/right)	20h52m47s.43
RA (bottom/left)	20h48m00s.60

Dec (center)	+31°29′55″.3
Dec (top/left)	+31°33′51″.8
Dec (top/right)	+30°38′52″.1
Dec (bottom/right)	+31°25′31″.1
Dec (bottom/left)	+32°21′00″.4

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Pickering's Triangle (NGC 6979)

Pickering's Triangle (NGC 6979)

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Image Index:

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Pickering's Triangle (NGC 6979)

Pickering's Triangle (NGC 6979)

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Acquisition details

Description

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C

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