NGC 40
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| Planetary nebula | Lists of nebulae |
|---|---|
 |
|
| Observation data (Epoch J2000) |
|
| Right ascension | 00h 13m 01.015s[1] |
| Declination | +72° 31′ 19.085″[1] |
| Distance | ~3,500 ly (~1.0 kpc)[2] |
| Apparent magnitude (V) | 11.4,[1] 12.3[2] |
| Apparent dimensions (V) | 38 x 35 arcseconds[2] |
| Constellation | Cepheus |
| Physical characteristics | |
| Radius | |
| Absolute magnitude (V) | |
| Notable features | |
| Other designations | Bow-Tie Nebula |
NGC 40 (also known as the Bow-Tie Nebula ) is a planetary nebula discovered by W.F.Herschel Nov 25 1788, and is comprised 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[citation needed] degrees (Celsius). Radiation from the star causes the shed outer layer to heat to about 10,000[citation needed] degrees (Celsius) and is about one[citation needed] light-year across. About 30,000[citation needed] years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth.[citation needed]
[edit] References
- ^ a b c SIMBAD Astronomical Database. Results for NGC 40. Retrieved on December 22, 2006.
- ^ a b c O'Meara, Stephen James (2002). Deep Sky Companions: The Caldwell Objects. Sky Publishing Corporation, 22-23. ISBN 0-933346-97-2.
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