NGC7023 - The Iris Nebula

Reflection Nebula in Cepheus

Uploaded 11/24/06

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This reflection nebulosity sits in a sea of dark nebula. So dense is the absorption here that nearly all the stars in this field are considerably reddened, and finding a guide star was a real challenge! The "Iris Nebula" as it is named resembles a blue human eye. Several key features here to take note of. The dust is illuminated very faintly by starlight from the nearby Milkyway stars. It appears brownish in color, and has openings allowing the stars to shine from behind. Such a structure to the right of the bright nebula is the "Star Window", the clarity of which determines the depth and quality of an image of this object.

While the bright nebulosity is NGC7023 which is about 15 arcminutes in diameter, the surrounding dark cloud is LBN487. Most amusingly, the star cluster inside the "Star Window" actually has a designation, Cr427 and is listed as 13.8 magnitude and 4 arcminutes in size. Now thats a faint star cluster!

Processing notes:

This is an LRGB image, with 4h of luminance data and 2h of RGB. A negative image masked Screen layer was applied to the L channel data to bring up the dim outer nebulosity. Finally, the image was recombined with the RGB data using a Hue layer to correct for any LRGB color distortion. Thus the color in this image rings true to the RGB data.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: SBIG ST4 Exposure: LRGB = 240:40:40:40 (RGB not binned) RGB Combine Ratio: 1: 1.05: 1.11 Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 8.5 arcsec (Maxim DL - 10min subframe), Transparency 8/10 Outside Temperature: 35 F CCD Temperature: -30 C Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, Starizona Debloomer. HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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