NGC 457

Introduction | Map | Sketch | My Own Observations | References

On this page I collect my observations of the globular star cluster NGC 457 in the constellation Cassiopeia.



The open star cluster NGC 457 in the constellation Cassiopeia got its name Owl Cluster due to its characteristic shape; it is also called E.T. Cluster. This object is fairly small und I need a telescope to see it. Using binoculars, I see only the brightest star, that is, one of the eyes, and perhaps a faint glow...

Size: 15' x 10' (Stoyan)
Distance: 7,900 light years (Stoyan)
Rating: *** (Stoyan)



NGC 457 (Owl Cluster, ET cluster) is at the right edge of the star field in Cassiopeia including M 103, NGC 654, and NGC 663. For orientation purposed, the Andromeda galaxy M 31 is included in the map, as well as the Perseus double cluster NGC 884/869 and above it St 2, which, according to Stoyan, is a "must" for small telescopes.



The sketch by Michael Vlasov ( provides a rough impression of what I observed in autumn 2017: Sketch of the NGC 457 Nebula by Michael Vlasov (Copyright © Michael Vlasov 2016)

Note: I only have the author's permission to link to the sketch.


My Own Observations

Observations September 2017

Observations September/October 2018



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