Messier 52 and the Bubble Nebula

Spent 3 hours imaging this target.

When I planned this imaging session, I didn’t realize I would get two targets in one image. Zoom into the Bubble Nebula just above right of the star cluster. It looks cool. I am surprised I got some of the emission nebulae as my camera is not good at picking up Hydrogen II gas as it is reddish.


“Messier 52 or M52, also known as NGC 7654, is an open cluster of stars in the highly northern constellation of Cassiopeia. It was discovered by Charles Messier in 1774. It can be seen from Earth under a good night sky with binoculars. The brightness of the cluster is influenced by extinction, which is stronger in the southern half.” Wikipedia

“NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M.” Wikipedia

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