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Bubble Nebula

Emission nebula in the constellation Cassiopeia

Field	Value
name	NGC 7635
image	File:The Bubble Nebula - NGC 7635 - Heic1608a.jpg
caption	Wide field image of NGC 7635 as captured by the Hubble Space Telescope
type	H II REGION
epoch	J2000
ra
dec
dist_ly	7100 to 11000
dist_pc	3,400
appmag_v	10
size_v	15 × 8
radius_ly	3 to 5
constellation	Cassiopeia
notes	Shell around SAO 20575
names	Bubble Nebula
Sharpless 162 (Sh2-162)
Caldwell 11

Sharpless 162 (Sh2-162) Caldwell 11

The Bubble Nebula, also known as NGC 7635, Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. It lies close to 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 November 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about .

Amateur observation

NGC 7635 and its environs imaged through an 8-inch amateur telescope

With an 8 or telescope, the nebula is 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. Using a 16 to scope, one can see that the faint nebula is irregular, being elongated in the north south direction.

Notes

References

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References

"NGC-IC Project Database".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

astronomical-objects-discovered-in-1787 caldwell-objects cassiopeia-(constellation) h-ii-regions ngc-objects sharpless-objects

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