NGC 40
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| NGC 40 | |
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| Observation data (Epoch J2000) |
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| Right ascension | 00h 13m 01.015s[1] |
| Declination | +72° 31′ 19.085″[1] |
| Distance | ~3,500 ly (~1.0 kpc)[2] |
| Apparent magnitude (V) | 10.7,[1] 11.6[2] |
| Apparent dimensions (V) | 38 x 35 arcseconds[2] |
| Constellation | Cepheus |
| Physical characteristics | |
| Other designations | Bow-Tie Nebula, Caldwell 2 |
NGC 40 (also known as the Bow-Tie Nebula and Caldwell 2) is a planetary nebula discovered by William Herschel on November 25, 1788, and is composed of hot gas around a dying star. The star has ejected its outer layer which has left behind a smaller, hot star with a temperature on the surface of about 50,000 degrees Celsius.[3] Radiation from the star causes the shed outer layer to heat to about 10,000 degrees Celsius,[3] and is about one light-year across.[3] About 30,000 years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth.[3]
Gallery
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The Bowtie Nebula HST.jpg
References
External links
- NGC 40 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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| See also | |
Coordinates: 
00h 13m 01s, +72° 31′ 19″
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