M52 & NGC7635
NGC 7635 (sometimes called the Bubble Nebula) is a diffuse nebula visible in the constellation of Cassiopeia, toward the border with Cepheus. It lies very close to the open cluster M52, so close that at low magnification it appears in the same field of view; its main feature is a “bubble” of empty space surrounded by nebulosity, visible with powerful instruments in the southern part of the object, caused by the stellar wind of the young central star, of magnitude 8.7. In an amateur telescope, the nebula itself shows up well, appearing to end in the south with an arc-like shape.
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