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Contains:  Iris Nebula, NGC 7023
Getting plate-solving status, please wait...
NGC 7023 • Iris Nebula from a White Zone, 


            Douglas J Struble
NGC 7023 • Iris Nebula from a White Zone
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NGC 7023 • Iris Nebula from a White Zone

Technical card

Dates:June 16, 2017June 18, 2017June 19, 2017June 22, 2017May 23, 2018May 24, 2018May 25, 2018June 13, 2020June 14, 2020June 15, 2020June 16, 2020

Astrnomik CLS-CCD: 724x60" (gain: 0.00) -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 217x60" (gain: 0.00) -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 211x60" (gain: 0.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 671x30" (gain: 0.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 575x60" (gain: 0.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 60x120" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky B: 176x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 176x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky R: 176x60" (gain: 0.00) -20C bin 1x1

Integration: 45.2 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 20.04 days

Avg. Moon phase: 44.66%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 3620059

RA center: 21h 1' 35"

DEC center: +68° 9' 18"

Pixel scale: 1.106 arcsec/pixel

Orientation: 290.582 degrees

Field radius: 0.501 degrees

Resolution: 2593x1976

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

Data source: Backyard


This is the third attempt to collect more data on the Iris Nebula from my white zone. I am still not very satisfied with the dark nebula and most likely will never be able to pull out the dark nebula definition from my white zone to my satisfaction. However, I do like the core of it's reflection.

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


NGC 7023 • Iris Nebula from a White Zone, 


            Douglas J Struble