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Nebula NGC 7023 Iris Nebula

Object :	NGC 7023 (Caldwell 4)
Coordinates/Direction :	RA: 21h01m, DEC: +68o10'
Object size :	18'x18'
Apparent magnitude :	6.8
Distance :	1.3 kly
Discovered by :	William Herschel, year 1794
Find in constellation :	Cepheus
More to know :	Wikipedia: https://en.wikipedia.org/ wiki/ Iris Nebula

NGC 7023 Nebula, 2023-04-01 and 2023-04-10 and 2024-03-06

Date :	2023-04-01 + 2023-04-10 + 2024-03-06
Time (UT) :	-

Exp. time :	164x60 seconds, iso1600, dithering mode
Image process tool :	Siril, GraXpert, Syqon, VeraLux, Gimp, Irfanview
Processing :	synth bias and color astrometry calibrated, dark subtracted, stars and nebula separated, stretch

Comment :

I had one hour exposure from 2024 that I added to the older images and got a total exposure of 164 minutes. Even this wasn't enough for this 6.8 magnitude nebula. Mostly because they are taken from the balcony at home.

NGC 7023 Nebula, 2023-04-01 and 2023-04-10 (Click on image and get a full resolution image in a new window)

Date :	2023-04-01 and 2023-04-10
Time (UT) :	-

Exp. time :	30x30 seconds and 120x60 seconds, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	Calibrated dark, flat and color
Weather :	clear

Comment :

When the season come close to the end it's in hurry to find more objects to take photographs of. This is the NGC 7023 nebula, even called Iris Nebula. It's a bright reflection nebula. The angle size of it is almost as the Moon, but still with a 300 mm lens it will be small. See the bright dot in center. Even when I collect exposures from two different nights as I have done here the nebula is weak. A total exposure of 135 minutes. The biggest problem when photographing nebulas is that you must have a dark sky or narrow band filters. That wasn't the case this time. Note how the surrounding of the nebula doesn't have many stars. The nebula is much bigger than the bright part, the empty area are where the nebula block the stars behind.

NGC 7023 Iris Nebula, 2024-03-06 (Click on image and get a full resolution image in a new window)

Date :	2024-03-06
Time (UT) :	23:10 - 00:09

Exp. time :	60x60 seconds = 60 minutes, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	Calibrated bias, flat and astrometric color
Weather :	clear, temperature +3o C

Comment :

The Iris Nebula is not far from us, only 1300 light years.

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