Iris Nebula (Caldwell 4) containing cluster NGC 7023 (Mike_Stutters)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7023 · VdB139

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Iris Nebula (Caldwell 4) containing cluster NGC 7023

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Iris Nebula (Caldwell 4) containing cluster NGC 7023

Located in the Constellation Cepheus, this lovely reflection nebula is about 1300 LY distance and 6LY across. Interstellar gas and dust is back-lit by the bright blue, magnitude +7 star, SAO 19158. Star cluster NGC7023 is contained within the tricorn hat-shaped void to the left of the nebula. Within the Iris itself, dusty nebular material surrounds a hot, young star. While the dominant color of the reflection nebula is blue, characteristic of dust grains reflecting starlight, there are small areas of faint reddish light where some of the star's invisible ultraviolet radiation has been absorbed by dust grains and then reemitted as visible red light.

Sources: Wikipedia and NASA APOD 2016 May 6

B

Description: After some reflection I decided that the high key treatment of the background dust did not work for me.

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D

Description: Reprocessed following capture of some additional luminance subs

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E

Description: Closer attention to background noise reduction

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Status	Advanced success
Started	...
Astrometry.net job	2908492
PixInsight job	68XA1GMLJPRY4H5MLC6K83ISEHW62LN9
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h01m37s.45
RA (top/left)	20h55m13s.12
RA (top/right)	21h07m34s.95
RA (bottom/right)	21h08m18s.61
RA (bottom/left)	20h55m22s.48

Dec (center)	+68°08′55″.7
Dec (top/left)	+67°38′49″.4
Dec (top/right)	+67°36′05″.4
Dec (bottom/right)	+68°38′06″.2
Dec (bottom/left)	+68°40′58″.6

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Iris Nebula (Caldwell 4) containing cluster NGC 7023

Iris Nebula (Caldwell 4) containing cluster NGC 7023

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Iris Nebula (Caldwell 4) containing cluster NGC 7023

Iris Nebula (Caldwell 4) containing cluster NGC 7023

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