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This wide field image contains multiple dim emission nebulae, with the brighter Bubble Nebula (NGC 7635) on the right hand side, and the open cluster, M52, just below and to the right of it.
The Bubble Nebula is a hydrogen line emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 pushing the gas away in an expanding wavefront. The nebula is near a giant molecular cloud that is also being excited by the hot central star providing the glowing background nebulosity. The Bubble Nebula was discovered in 1787 by William Herschel, but is difficult to detect visually with anything but the larger amateur telescopes in extremely dark skies.
M52, also known as NGC 7654 or the Scorpion Cluster, is an open cluster of stars in the northern constellation of Cassiopeia. It was discovered by Charles Messier in 1774. It is visible with binoculars or a low magnification telescope under a good night sky.
The image also contains the nebula NGC 7538 and the open cluster NGC 7419.
This image is a stack of 868 unguided one-minute exposures taken with my 0.8x AT60ED and QHY268C and processed in PixInsight.
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