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The Ring Nebula in Barnard's Galaxy has the official designation of Hubble 1925 III as it was the third (Roman numeral 3) object recorded in Hubble's 1925 paper, N.G.C. 6822, A Remote Stellar System. It includes areas of bright H II emission. In Paul W. Hodge's 1977 paper it was designated Hodge 4.
| Emission nebula | |
|---|---|
| H II region | |
 The Ring Nebula (lower right) seen with the Bubble Nebula (upper left) as taken at the La Silla Observatory | |
| Observation data: J2000.0 epoch | |
| Right ascension | 19h 44m 36s |
| Declination | −14° 41′ 42″ |
| Distance | 1.63 million ly (0.500 Mpc pc) |
| Apparent magnitude (V) | ~14.5 |
| Apparent dimensions (V) | 53″ |
| Constellation | Sagittarius |
| Physical characteristics | |
| Radius | ~419 ly (128.4 pc) (estimated) ly |
| Designations | Hubble 1925 III, Hodge 4, NGC 6822B, NGC 6822-2, IRAS 19421-1455, DDO 209, LEDA 63616, HIPASS J1944-14, 2MASX J19445619-1447512, IC 4895, MCG-02-50-006 |
Its appearance is very similar to the filamentary nebula found in the Large Magellanic Cloud (see Meaburn 1981). It most resembles the circular ring-like nebula N70 in the LMC.
In 1987 this object Hubble III in NGC 6822, was observed with the Manchester Echelle Spectrometer II.[1]
See also
editReferences
edit- ^ Clayton, C. A. (1987-06-01). "The dynamics of the giant ring nebula Hubble III in NGC 6822". Monthly Notices of the Royal Astronomical Society. 226 (3): 493–504. doi:10.1093/mnras/226.3.493. ISSN 0035-8711.
External links
edit- Simbad
- Clayton, C.A. "The Dynamics of the giant ring nebula Hubble III in NGC 6822", Monthly Notices of the Royal Astronomical Society, vol. 226, May 15, 1987, p. 493-504
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