NGC 40
From Wikipedia, the free encyclopedia
For the Bow Tie Nebula in Centaurus, see Boomerang Nebula.
| NGC 40 | |
|---|---|
 |
|
| 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 | |
| Other designations | Bow-Tie Nebula, Caldwell 2 |
| See also: Planetary nebula, Lists of nebulae | |
NGC 40 (also known as the Bow-Tie Nebula and Caldwell 2) is a planetary nebula discovered by W.F.Herschel Nov 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[3] degrees (Celsius). Radiation from the star causes the shed outer layer to heat to about 10,000[3] degrees (Celsius) and is about one[3] light-year across. About 30,000[3] years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth.[3]
[edit] References
- ^ a b c "SIMBAD Astronomical Database". Results for NGC 40. http://simbad.u-strasbg.fr/Simbad. Retrieved 2006-12-22.
- ^ a b c O'Meara, Stephen James (2002). Deep Sky Companions: The Caldwell Objects. Sky Publishing Corporation. pp. 22–23. ISBN 0-933346-97-2.
- ^ a b c d e "Chandra X-Ray Observatory". http://chandra.harvard.edu/photo/2005/n40/. Retrieved 2007-06-05.
[edit] External links
- NGC 40 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
| Astronomical catalogs | ||
|---|---|---|
| NGC: | NGC 38 - NGC 39 - NGC 40 - NGC 41 - NGC 42 | |
| Caldwell: | C1 - C2 - C3 - C4 | |
|
|||||||||||
Coordinates: 
00h 13m 01s, +72° 31′ 19″
 |
This star-related article is a stub. You can help Wikipedia by expanding it. |
