Sky at Night Magazine - - THE SKY GUIDE -

The Bub­ble Neb­ula, NGC 7635, gets its name be­cause it con­tains an oval bub­ble fea­ture blown in neb­ula ma­te­rial by the young mag. +8.7 star SAO 20575. This star is es­ti­mated to be 44 times as mas­sive as our Sun and 398,000 times as lu­mi­nous. The bub­ble is ac­tu­ally a sphere of ma­te­rial, but only the fore­short­ened edges of the sphere ap­pear dis­tinct. The neb­ula lies 0.5º to the south­west of M52 and can be seen with a 10-inch scope (or a 8-inch scope un­der good con­di­tions) as a faint ring.

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