NGC 457, Owl Cluster

About image 

NGC 457 is an open cluster in Cassiopeia, also called Owl Cluster due to its particular shape: in fact it is characterized by the presence of two bright stars of sixth magnitude from which a concatenation of stars that resemble the wings of a bird in flight starts; the two bright stars are the "eyes" of the owl. 

The cluster is made up of about sixty stars and is about 8000 light years away: it is a young cluster, having an estimated age of around 21 million years. 

Countless far galaxies are visible in the background.

Technical data
Optic          GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount        10Micron GM2000 HPSII
Camera         Moravian G3-16200 with external filter wheel 7 positions
Filters         Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted RGB  
Guiding system    OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details  R 19x300" bin2 -25C
          G 18x300" bin2 -25C
          B 17x300" bin2 -25C
Total integration  4h30'
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5
SQM-L       19.5    
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date           25 October 2021


© Roberto Marinoni 2019 - All rights reserved