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Contains:  NGC 7023
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Iris Nebula from a Red Zone - NGC 7023, 


            Douglas J Struble
Iris Nebula from a Red Zone - NGC 7023

Iris Nebula from a Red Zone - NGC 7023

Technical card

Resolution: 4801x3840

Dates:June 16, 2017June 18, 2017June 20, 2017June 22, 2017May 16, 2018May 23, 2018May 24, 2018

Astrnomik CLS-CCD: 724x60" -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 217x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 211x60" -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 671x30" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 60x120" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 103x60" -20C bin 1x1

Integration: 28.5 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 16.73 days

Avg. Moon phase: 37.50%

Bortle Dark-Sky Scale: 6.00 job: 2089581

RA center: 315.415 degrees

DEC center: 68.161 degrees

Pixel scale: 0.554 arcsec/pixel

Orientation: 289.207 degrees

Field radius: 0.473 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


This is the first time combing data from two different years and two different scopes. Being in a red zone, one of the most highly light polluted areas, it is very hard to pull out dark nebula and IFN. It was my goal to see if I can pull out any combing data from both years. I think I made some advancements. Still not the greatest given my overall integration time, but it worked. Colors look a little muted here, but looks perfect when printed so I am not going to overcompensate the saturation.

NGC 7023 is a reflection nebula located in the west central section of the far northern constellation of Cepheus. The nebula contains at its centre an extremely young star named V380 Cep (mag. +7.1) which is believed to have burst into life just 5,500 years ago. Since still incredibly young there is plenty of local dust surrounding the star and when starlight hits the dust it's reflected to become the visible nebula.

NGC 7023 is located 6 degrees northwest of the brightest star in Cepheus, Alderamin (α Cep - mag. +2.5) with third magnitude Alfirk (β Cep) positioned about 3.5 degrees to the northeast. Only a degree east-northeast of NGC 7023 is Mira type variable star T Cep, which fluctuates between magnitudes +5.2 and +11.3 over a period of 388.14 days. A faint eleventh magnitude barred-spiral galaxy, NGC 6951, is positioned two degrees southwest of NGC 7023.

The nebula is also known as the Iris Nebula and is number 4 in the Caldwell catalogue. It was discovered by Sir William Herschel on October 18, 1794.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


Iris Nebula from a Red Zone - NGC 7023, 


            Douglas J Struble