Dumbbell nebula
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Planetary Nebula NGC 6853 / Dumbbell Nebula |
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| Image taken in the light of the hydrogen line (red) and oxygen line (green) with the Very Large Telescope . | |
| AladinLite | |
| Constellation | Fox |
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Position equinox : J2000.0 |
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| Right ascension | 19h 59m 36s |
| declination | + 22 ° 43 ′ 16 ″ |
| Appearance | |
| Apparent brightness (visual) | 7.5 likes |
| Angular expansion | 8.0 '× 5.7' |
| Central star | |
| Apparent brightness | 14 likes |
| Physical data | |
| Redshift | −0.000140 ± 0.000017 |
| Radial velocity | (−42 ± 5) km / s |
| distance | approx. 1400 ly (approx. 400 pc ) |
| diameter | 3 years |
| Age | 8,700 - 14,600 years |
| history | |
| discovery | Charles Messier |
| Date of discovery | July 12, 1764 |
| Catalog names | |
| NGC 6853 • PK 60 + 3.1 • GC 4532 • | |
The Dumbbell Nebula (also called Messier 27 or NGC 6853 , from English also Dumbbell Nebula ) is a 7.5 mag bright planetary nebula with an area of 8.0 × 5.7 arc minutes in the constellation Fuchs . It is just visible in the binoculars, and further structures can be seen in the telescope. The central star is a white dwarf of 14 mag and a temperature of over 100,000 Kelvin . The distance is around 1400 light years . It got its name from Sir William Herschel because of its elongated shape. The nebula expands at 6.8 arc seconds per century . The dumbbell nebula was discovered by Charles Messier on July 12, 1764.
Appearance
Under a dark, clear sky away from large cities, the PN (Planetary Nebula) can already be seen in good binoculars as a star-like object. The dumbbell shape of the nebula can already be identified with telescopes with an opening of 10 cm. However, only larger telescopes from 20 cm aperture show finer structures. The halo surrounding the PN can only be seen photographically with normal amateur telescopes.
Web links
- Bill Snyder: M27: The Dumbbell Nebula , APOD , Dec 27, 2011
- Don Goldman: M27 Deep Halo
- Spektrum.de : Collection of amateur recordings
Individual evidence
- ↑ SIMBAD Astronomical Database
- ↑ Messier 27 at SEDS
- ↑ a b c G. Fritz Benedict u. a .: Astrometry with The Hubble Space Telescope: A Parallax of the Central Star of the Planetary Nebula NGC 6853. In: The Astronomical Journal. 2003, pp. 2549-2556.
- ↑ O'Dell, CR; Balick, B .; Hajian, AR; Henney, WJ; Burkert, A .: Knots in Nearby Planetary Nebulae . In: Astronomical Journal . 123, No. 6, 2002, pp. 3329-3347. bibcode : 2002AJ .... 123.3329O . doi : 10.1086 / 340726 .
- ↑ Seligman
