NGC 7635
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| Emission nebula | Lists of nebulae |
|---|---|
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| Observation data (Epoch J2000) |
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| Type | Emission[1] |
| Right ascension | 23h 20m 48.3s[2] |
| Declination | +61° 12′ 06″[2] |
| Distance | 11 kly (3.4 kpc)[3][4] |
| Apparent magnitude (V) | |
| Apparent dimensions (V) | 15′ × 8′[1] |
| Constellation | Cassiopeia |
| Physical characteristics | |
| Radius | 5 ly[5][4] |
| Absolute magnitude (V) | Unknown |
| Notable features | Shell around SAO 20575[2] |
| Other designations | Bubble Nebula[2] |
| edit | |
NGC 7635 in the constellation Cassiopeia is a H II region,[2] emission nebula. 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[2] magnitude young central star, the 15 ± 5 M☉[3] SAO 20575 (BD+60 2522).[5] 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.[5]
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[edit] Amateur observation
With an 8 or 10 inch telescope, the nebula is visible as an extremely faint and large shell around the star.[1][2] The nearby 7th magnitude star on the west hinders observation, but one can view the nebula using averted vision.[1] Using a 16 to 18 inch scope, one can see that the faint nebula is irregular, being elongated in the north south direction.[1]
[edit] See also
[edit] Notes
[edit] References
- APOD (July 16, 2004), Astronomy Picture of the Day: The Bubble, NASA
- APOD (November 7, 2005), Astronomy Picture of the Day: NGC 7635: The Bubble Nebula, NASA
- APOD (October 18, 2006), Astronomy Picture of the Day: NGC 7635: The Bubble, NASA
- Kepple, George Robert & Glen W. Sanner (1998), The Night Sky Observer's Guide, vol. 1, Willmann-Bell, Inc., ISBN 0-943396-58-1
- SIMBAD (February 23, 2007), Results for NGC 7635, SIMBAD, Centre de Données Astronomiques de Strasbourg
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