The Sh2-134 complex in Cepheus is a vaste emission nebula that extends around the star λ Cephei . It is characterized by a diffuse Ha and Sii emissions and a much weaker Oiii region that surrounds the star.
The image is the result of a two panels mosaic for a total of 26hrs of exposure (4.5hrs of Ha, Sii and Oiii for each panel) combined in narrowband Hubble palette
High resolution here
Caprile Astronomical Observatory, Astrophotography, located in Tuscany (Italy) countryside. A photographic journey across the marvels of the universe | Galaxy | Nebulae | Deep Sky Objects
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