NGC1499 (California nebula) in RGB+Ha (Anders Johannesson)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: 46 ksi Per · California Nebula · IC 2005 · LBN 752 · LBN 756 · LDN 1462 · LDN 1463 · LDN 1464 · LDN 1469 · Menkib · NGC 1499 · Sh2-220 · The star ξPer

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NGC1499 (California nebula) in RGB+Ha

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NGC1499 (California nebula) in RGB+Ha

This is the well known HII region in Perseus that is called the California nebula due to its shape. It consists mostly of Hydrogen gas that has been excited by the bright star Menkib, the brightest star in this image located just under the nebula.

In the visible, light is coming mostly in the H-alpha (red) and the H-beta (blue) spectral lines of Hydrogen. In my R, G and B images I can see clear signal in R and in B only, most likely due to the above. So, I decided to only image in H-alpha + RGB this time, since I do not have any H-beta filter.

While doing the RGB H-alpha combination, I tried to do it in a way that would not destroy the beatiful structures visible in H-alpha. H-alpha is really just a B/W signal, but to give it a bit of drama I decided to do some extra processing. What I did was to reduce the stars a bit so that they don't dominate and then use the color channels to lift out the beautiful details of the H-alpha signal. I hope you like it.

Original
Final
B

"Nordish by nature"

Narrowband

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Status	Advanced success
Started	...
Astrometry.net job	5382471
PixInsight job	EV8FQ00VZ9QG8UQ5XJ08WWCR8B6R5PNS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h00m48s.98
RA (top/left)	04h07m26s.50
RA (top/right)	03h59m11s.89
RA (bottom/right)	03h54m09s.42
RA (bottom/left)	04h02m22s.79

Dec (center)	+36°25′07″.6
Dec (top/left)	+36°12′43″.10
Dec (top/right)	+37°43′48″.2
Dec (bottom/right)	+36°36′05″.1
Dec (bottom/left)	+35°06′19″.4

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NGC1499 (California nebula) in RGB+Ha

NGC1499 (California nebula) in RGB+Ha

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NGC1499 (California nebula) in RGB+Ha

NGC1499 (California nebula) in RGB+Ha

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