How to find Caldwell 4, The Iris Nebula

How to Find Caldwell 4, The Iris Nebula

Iris nebula Caldwell 4 NGC 7023 .jpg

Caldwell 4, the iris nebula is a diffuse reflection nebula 1,300 light years away. It was discovered by Herschel in 1794. The star causing the beautiful reflection is a young, hot magnitude 7 star. The nebula is 30 light years across. Otherwise known as NGC 7023 this nebula is a must see object in the night sky.

Image by: Hewholooks

Telescopic Image to Scale:

Caldwell 4 telescope image .jpg

This image is the size of a full moon for size comparison.

Other Names:

Caldwell 4

NGC 7023

C 4

Iris Nebula


Magnitude = 7.0

Surface brightness = 10.5

Telescope Aperture City Suburbs Rural Dark Sky
4 inches 9 10 11 12.5
5 inches 9.5 10.5 11.5 13
6 inches 10 11 12 13.5
8 inches 10.5 11.5 12.5 14
10 inches 11 12 13 14.5

Use this chart to estimate if you can see the object from your location with your telescope. For more help on using this chart click here.

How to Find It:

This galaxy resides in the Cepheus Constellation. It can be found in the crosshairs on the map below. It's co-ordinates are: RA 21h 01m 58.92 DEC +68° 15′ 22.8″ if you are using guiding software.

How to find Caldwell 4, The Iris nebula

To find more space objects have a look at the constellation guide by clicking the link or go back to the list of deep space objects.

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