NGC 6894
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Planetary Nebula NGC 6894 |
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| Image of the planetary nebula NGC 6894 with the 81 cm diameter mirror telescope of the Mount Lemmon Observatory . | |
| AladinLite | |
| Constellation | swan |
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Position equinox : J2000.0 |
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| Right ascension | 20h 16m 24.0s |
| declination | + 30 ° 33 ′ 54 ″ |
| Appearance | |
| Apparent brightness (visual) | 12.3 mag |
| Apparent brightness (B-band) | 14.4 mag |
| Angular expansion | 0.92 ' |
| Central star | |
| Apparent brightness | 15.8 mag |
| Physical data | |
| Redshift | −0.000193 |
| Radial velocity | −58.0 km / s |
| history | |
| discovery | William Herschel |
| Date of discovery | July 17, 1784 |
| Catalog names | |
| NGC 6894 • PK 69-2.1 • GC 4565 • H IV 13 • h 2072 • | |
NGC 6894 is a planetary nebula in the constellation Swan . The nebula was discovered in 1784 by the astronomer William Herschel using his 18.7 inch reflecting telescope and was later listed by Johan Dreyer in his New General Catalog .