How To Find Caldwell 13, The Owl Cluster

How To Find Caldwell 13, The Owl Cluster

Caldwell 13 NGC457.jpg

Caldwell 13 or NGC 457 is an open cluster found 8,000 light years away. Herschel discovered it in 1787. This open cluster is also called the Owl cluster or ET cluster due to the two bright magnitude five stars that form the ‘eyes’. It contains about 150 stars.

Image by: Henryk Kowalewski


Telescopic Image to Scale:


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

Other Names:

Caldwell 13

NGC 457

C 13

Dragonfly Cluster

Kachina Doll Cluster

ET Cluster


Magnitude = 6.4

Surface brightness = UNK

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 open cluster officially resides in the Cassiopeia Constellation. It's co-ordinates are: RA 23h 31m 08.45 DEC +47° 16′ 37.6″ if you are using guiding software. The image below shows its location in the crosshairs.

How to Find Caldwell 13, The Owl Cluster

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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