Ring Nebula
| Nebula | |
|---|---|
|
|
| Observation data: J2000 epoch | |
| Right ascension | 18h 53m 35.079s |
| Declination | +33° 01′ 45.03″ |
| Distance |
2.3+1.5 −0.7 kly (700+450 −200 pc) ly |
| Apparent magnitude (V) | 8.8 |
| Apparent dimensions (V) | 230″ × 230″ |
| Constellation | Lyra |
| Physical characteristics | |
| Radius |
1.3+0.8 −0.4 ly ly |
| Absolute magnitude (V) | −0.2+0.7 −1.8 |
| Notable features | - |
| Designations | M 57,NGC 6720,GC 4447. |
The Ring Nebula (also catalogued as Messier 57, M57 or NGC 6720) is a planetary nebula in the northern constellation of Lyra. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf.
This nebula was discovered by the French astronomer Antoine Darquier de Pellepoix in January 1779, who reported that it was "...as large as Jupiter and resembles a planet which is fading". Later the same month, fellow French astronomer Charles Messier independently found the same nebula while searching for comets. It was then entered into his catalogue as the 57th object. Messier and German-born astronomer William Herschel speculated that the nebula was formed by multiple faint stars that were unresolvable with his telescope.
In 1800, German Count Friedrich von Hahn announced that he had discovered the faint central star at the heart of the nebula a few years earlier. He also noted that the interior of the ring had undergone changes, and said he could no longer find the central star. In 1864, English amateur astronomer William Huggins examined the spectra of multiple nebulae, discovering that some of these objects, including M57, displayed the spectra of bright emission lines characteristic of fluorescing glowing gases. Huggins concluded that most planetary nebulae were not composed of unresolved stars, as had been previously suspected, but were nebulosities. The nebula was first photographed by the Hungarian astronomer Eugene von Gothard in 1886.
Messier 57 is located south of the bright star Vega, which forms the northwestern vertex of the Summer Triangle asterism. The nebula lies about 40% of the distance from Beta (β) to Gamma (γ) Lyrae, making it an easy target for amateur astronomers to find.
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