Observation by John Hughes: NGC 7023 - Iris Nebula

Uploaded by

Mr John William Hughes


John Hughes


2019 May 21 - 22:48


2019 May 28 - 11:57


The Iris Nebula (NGC7023)

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Field centre

RA: 21h01m
Dec: +68°09'
Position angle: +97°18'

Field size

1°51' × 1°16'

  • William Optics Z103ED
  • ZWOASI294MC Pro Cooled Camera
  • Celestron AVX Mount
  • IDAS D2 LPS Filter
  • PixInsight & Photoshop

Gain 300, Exposure 180s


North Essex, UK

Target name

NGC 7023


NGC 7023 - Iris Nebula

About this image

For me, NGC 7023 is situated well for imaging featuring high in the North and rising.

This is a reflection nebula located within the constellation Cepheus. A magnitude +7 star which itself is part of a small star cluster lights up the gas giving it its blue hue. Dust also surrounds the nebula which obscures the light of some of the background stars. 

This image is made up of 20 exposures. I would have liked to have captured more data but unfortunately the clouds drifted into view.

Originally I had a massive circular artefact in the bottom left hand corner which was not removed by my flat frames. My flats were taken the next morning so whatever was on the lens during the session clearly disappeared afterwards. As a result, a synthetic flat was applied which has allowed me to present a wide field image rather than the heavily cropped original.


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