NGC 2237 and the Rosette Nebula (at least some of it) (Alex Woronow)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: 12 Mon · NGC 2237 · NGC 2238 · NGC 2239 · NGC 2244 · Rosette A · Rosette Nebula · Sh2-275 · The star 12Mon

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NGC 2237 and the Rosette Nebula (at least some of it)

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NGC 2237 and the Rosette Nebula (at least some of it)

NGC 2237 and the Rosette Nebula (at least some of it)[b] [/b]
OTA:……………….PlaneWave 17” f/6.8
Camera:………….FLI ML16803
Observatory:…. Deep Sky West, Chile

EXPOSURES:
…O.….11 x 1800
…H.….13 x 1800
…S.….12 x 1800

Total exposure 18 hours
Image Width: 40.5 arc-minutes
Processed by Alex Woronow (2021) using PixInsight, Skylum, Topaz, SWT

The posted image is downsampled about 2.5x. Processing: The starting color scheme used for this narrowband SHO image lies in the family of “ordered colors” color-mapping schemes. But I’ve implemented it slightly differently so that the red channel has all the SII and most of the Ha, with the rest of the Ha going into the green (because Ha is “less red” than SII). By the same approach, green is about half of the OIII signal and a bit of the Ha signal, effectively, to lessen the Ha redness. Finally, the blue channel is the rest of the OIII signal and, to account for the omnipresent, even when not explicitly imaged, H-beta contributes about 0.34*Ha to the blue. Finally, just to screw with nature and get non-obnoxious stars, I did a photometric color calibration.

There are so many opportunities for interestingly and beautifully images-palette alternative narrowband pallets; why stick to that eye-wrenching Hubble Palette? To quote from the beautiful book, Coloring the Universe (Rector, et al. 2015), “…there’s no set palette. It depends on the filters used, the object observed, and to a certain degree the preferences of the person making the image.” The authors also note “…in reality only a small fractions of the images from Hubble use this scheme [the Hubble Palette].” So let us make stunning pictures without imaginary restraints.

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Status	Advanced success
Started	...
Astrometry.net job	4830417
PixInsight job	VWXSAC9NA7TKICM1GAY7YGR8AJVAN8PN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h30m58s.55
RA (top/left)	06h32m19s.69
RA (top/right)	06h29m37s.70
RA (bottom/right)	06h29m37s.49
RA (bottom/left)	06h32m19s.91

Dec (center)	+05°07′27″.7
Dec (top/left)	+05°27′44″.4
Dec (top/right)	+05°27′39″.6
Dec (bottom/right)	+04°47′10″.3
Dec (bottom/left)	+04°47′15″.10

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NGC 2237 and the Rosette Nebula (at least some of it)

NGC 2237 and the Rosette Nebula (at least some of it)

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Image Index:

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NGC 2237 and the Rosette Nebula (at least some of it)

NGC 2237 and the Rosette Nebula (at least some of it)

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