Hemisphere:  Northern  ·  Contains:  NGC 7023
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Iris Nebula (NGC 7023), 


Iris Nebula (NGC 7023)
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Iris Nebula (NGC 7023)

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: None

Software: PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  PHD Guiding 2  ·  CCDWare CCD Inspector  ·  Planewave PWI4  ·  Planewave PWI3  ·  Maxim DL6  ·  Neat Image V7

Filters: Astrodon 50mm B  ·  Astrodon 50mm R  ·  Astrodon 50mm L  ·  Astrodon 50 mm G

Accessory: FLI CFW-5-7  ·  Astrodon Monster MOAG  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA

Dates:Aug. 31, 2019Sept. 1, 2019

Astrodon 50 mm G: 7x900" -30C bin 1x1
Astrodon 50mm B: 9x900" -30C bin 1x1
Astrodon 50mm L: 9x900" -30C bin 1x1
Astrodon 50mm R: 8x900" -30C bin 1x1

Integration: 8.2 hours

Darks: ~20

Flats: ~80

Flat darks: ~80

Bias: ~20

Avg. Moon age: 1.84 days

Avg. Moon phase: 4.12%

Mean SQM: 21.40

Mean FWHM: 1.80

Basic astrometry details

Astrometry.net job: 2897327

RA center: 21h 1' 36"

DEC center: +68° 10' 12"

Pixel scale: 0.467 arcsec/pixel

Orientation: 177.638 degrees

Field radius: 0.349 degrees

Resolution: 1824x1799

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


For the August dark cycle, I decided to switch from galaxies to the plentiful reflection nebula that work well with LRGB and my FOV.

I was aiming for my usual 15 hours, but a sudden storm limited me to just 2 hours L and 2 hours in each RGB channel (8 hours total). This was my second and last object for this August. Still working #1. (-:

Fortunately FWHM was under 2" on the few 15-minute L subs, so nothing was wasted. "The calm before the storm" I suppose.

PI HDR is key to unlocking the bright center. Color should be fairly accurate with PI > PCC using an Average Spiral Galaxy reference.

Down to Earth, this reminds me of our sun peaking through our clouds.

Comments are always appreciated!

"These cosmic clouds have blossomed 1,300 light-years away, in the fertile starfields of the constellation Cepheus. Called the Iris Nebula, NGC 7023 is not the only nebula to evoke the imagery of flowers. Still, this image shows off the Iris Nebula's range of colors and symmetries, embedded in surrounding fields of interstellar dust. Within the Iris itself, dusty nebular material surrounds a hot, young star. The dominant color of the brighter reflection nebula is blue, characteristic of dust grains reflecting starlight. Central filaments of the reflection nebula glow with a faint reddish photoluminesence as some dust grains effectively convert the star's invisible ultraviolet radiation to visible red light. The pretty blue petals of the Iris Nebula span about six light-years."



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    Iris Nebula (NGC 7023), 


    Iris Nebula (NGC 7023), 


  • Final
    Iris Nebula (NGC 7023), 




Description: Turned down brightness a bit.


Description: A bit more noise reduction to help compensate for 2 hours (vs 6 normal) for L.

Sky plot

Sky plot


Iris Nebula (NGC 7023),