SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia (Phil Swift)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble Nebula · NGC 7538 · NGC 7635

SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia, Phil Swift

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SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia

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SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia

Sh2 -157 (the Lobsters Claw Nebula) is a weak emission nebula of considerable size visible in the constellation of Cassiopeia.
It is located in the Perseus Arm of our Milky Way Galaxy.
The northern part of the cloud has a ring shape, caused by the action of the stellar wind of several giant stars, while the southern sector appears to be excited by the radiation of a cluster of very young stars (spectral class O), representing the latest generation of a star-forming region, at its centre.
The nebula is located in the westernmost part of the constellation, on the border with Cepheus.
It is not optically observable, in either binoculars or small/medium amateur telescopes.

NGC7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region, emission nebula also in 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.
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 times that of our Sun.
With an 8 or 10-inch (200 - 250 mm) telescope, the nebula is just visible as an extremely faint and large shell around the star. The nearby 7th magnitude star on the west hinders observation, but one can view the nebula using averted vision.

This image was taken as two separate panels and then these were 'stiched' togther as part of the processing in Pixinsight.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia

SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia

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SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia

SH-157 The Lobster Claw and NGC7635 The Bubble Nebulae in the constellation of Cassiopeia

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