NGC 457, the Owl cluster

About image
NGC 457 is an open cluster in the constellation of Cassiopeia.
Because of its particular shape it is also called "the Owl cluster": in fact it is dominated by two stars of sixth magnitude from which it starts a concatenation of stars that recall well the wings of a bird in flight; the two brightest stars are the "eyes" of the owl.
In reality, the brightest stars in the cluster would be much closer to us, and show themselves in the direction of the cluster for a perspective effect. NGC 457 is composed of about sixty stars up to the fourteenth magnitude and is about 8000 light years.

Technical data
Optic            Celestron C9.25 Edge HD f/10
Mount          Losmandy G11 with Ovision worm and FS2
Camera           Atik 4000 with Starlight Xpress filter wheel 5 positions
Filters        Baader RGB 50.8 unmounted
Guiding system      Starlight Xpress SXV-AO-LF + OAG Starlight Xpress with Lodestar
Exposure details    R 12x300" bin1 -20C
            G 12x300" bin1 -20C
                                      B 12x300" bin1 -20C
Total integration    3h
Acquisition       Maxim, PHD2
Processing       Pixinsight 1.8, Photoshop CS5
SQM-L        18.3     
Location        Home terrace (Rescaldina, Italy)
Date           24 September 2016

© Roberto Marinoni 2019 - All rights reserved