NGC 457 The Owl/ET Cluster - a photo on Flickriver

            NGC 457 is the brightest open cluster in Cassiopeia and one of the finest objects of its type in the northern sky. At magnitude +6.4, it's just beyond naked-eye visibility but I viewed it visually last weekend through my 107mm APO and I was struck by its beauty.  The eyes of the Owl - or ET- are formed by the bright double star Psi Cassiopeia and are not part of the cluster itself, but are older foreground stars and are yellow-white in colour.  The 10th - 12th magnitude stars of the cluster, proper, are blue-white and arranged in prominent lines and curves lines and resemble the body and wings of an Owl.   

This RGB image was captured on 26, 27 and 28 November with 20 x two-minute subs per colour. It is presented North down to give an upright figure.

Equipment:
Telescope: 8" Ritchey-Chretien with an Astrophysics CCDT67 reducer;
Camera: QSI 583 with Astrodon filters.

Taken on: December 13, 2017

Tags:

NGC457

Owl Cluster

ET Cluster

Sets appears in: • Star Clusters

Groups appears in: • Astrophotography - Astronomy - Astrophysics • Astronomers Talk more » • BBC Sky at Night and Stargazing Live • LDAS Astrophotography Group • in explore « less

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