NGC 7023

Iris Nebula

The iris nebula is a blue reflection nebula with an open star cluster in the constellation Cepheus, which is illuminated by a central, hot star.


recording data

objct NGC 7023
date of recording
February 14, 2017
exposure 8.1 h, RGB: 242x120" ISO1000
telescope Celestron RASA F2.2
focal lenght 620mm
filter IDAS LPS D1
camera Canon EOS 5Da MKII
guiding 250mm guide scope, MGEN
mount Celestron CGE pro
AstroBin click here

Like An eye in the night

Like cosmic petals, the clouds of interstellar dust and gas, 1,300 light years from Earth, appear in the star fields of the northern constellation Cepheus. It is called the Iris Nebula with its embedded open star cluster and catalogued as NGC 7023. This remarkable object shows impressively and in detail the range of colours nature has to offer. Within the iris, dusty, foggy matter surrounds a hot, young star. The predominant colour of the brighter reflection nebula is blue, which is characteristic for dust grains that reflect starlight. Individual filaments in the middle of the dust clouds glow with a delicate magenta, as some of the dust grains convert the invisible ultraviolet radiation into visible red light. Infrared observations suggest that this nebula contains complex carbon molecules known as PAHs. The light blue part of the iris nebula is about six light years large. It was discovered in 1794 by Sir William Herschel.

Baerenstein Observatory

private observatory
Marcel Drechsler





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