NGC7023 Iris Nebula in L(LRGB) (Rick Veregin)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Iris Nebula · NGC 7023 · PGC 2817439 · VdB139

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NGC7023 Iris Nebula in L(LRGB)

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NGC7023 Iris Nebula in L(LRGB)

The bluish glow of the Iris Nebula is a reflection of the light from the hot, massive star at the center of the nebula, HD 200775. The star's light is scattered off dust grains in the nebula (which are 10 to a 100 times smaller than dust particles in our own atmosphere), giving the nebula's core its distinctive blue color. The filaments of the nebula glow with a faint reddish photoluminescence as some dust grains have converted the star's invisible ultraviolet radiation to visible red light. Infrared observations indicate that this nebula contains complex carbon molecules known as PAHs, polyaromatic hydrocarbons. We are exposed to these compounds in smoke, car fumes and asphalt vapors to name a few. So space is polluted too--though ironically these PAHs are potentially key precursors to the beginning of life. The Iris Nebula (and its pollution or beginnings of life?) is about 1300 light-years away. The blue petals are about 6 light years across.

The image data is from the RASC Robotic Telescope, details below. I stacked with DSS, then processed with StarTools as LRGB, Topaz AI Lowlight Noise Reduction and Photoshop using an L(LRGB) protocol.

The RASC Robotic Telescope

Date 2019 July 1st, 4th, 5th

RGB 600 sec subs 2x2 Total: R=110 min, G=90 min, R=120 min

Lum 900 sec subs 1x1 Total: 360 min

RGBL Flats 5, Darks 25, Bias 16

Location Sierra Remote Observatories, Aubery, California

Telescope RCOS 16" f/8.9 (3550mm focal length)

Camera SBIG STX16803 16MP (4096 x 4096)

Mount Paramount ME

Filters SBIG LRGB

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Status	Advanced success
Started	...
Astrometry.net job	4696094
PixInsight job	J9SAZACWG2AY9ME45ONASV14P49M8L6A
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h00m21s.24
RA (top/left)	20h58m34s.85
RA (top/right)	20h56m43s.58
RA (bottom/right)	21h02m04s.29
RA (bottom/left)	21h04m02s.10

Dec (center)	+68°07′55″.8
Dec (top/left)	+68°28′35″.2
Dec (top/right)	+67°57′27″.0
Dec (bottom/right)	+67°47′08″.9
Dec (bottom/left)	+68°18′05″.9

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NGC7023 Iris Nebula in L(LRGB)

NGC7023 Iris Nebula in L(LRGB)

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NGC7023 Iris Nebula in L(LRGB)

NGC7023 Iris Nebula in L(LRGB)

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