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Planetary nebula in the constellation Orion From Wikipedia, the free encyclopedia
Abell 13 (known as the Onion ring nebula)[2] is a flarge and highly evolved planetary nebula located 3900 light years from Earth in the constellation of Orion.[3] It has a reddish color and is very faint. Abell 13 has a circular outer ring of Ha (Hydrogen-alpha).[4]
Emission nebula | |
---|---|
Planetary nebula | |
Observation data: J2000 epoch | |
Right ascension | 06h 04m 47.9s[1] |
Declination | +03° 56′ 36″[1] |
Distance | 3900 ly |
Apparent magnitude (V) | 19.87[1] |
Apparent dimensions (V) | 2' 32".58[1] |
Constellation | Orion |
Notable features | An attractive PN |
Designations | A66 13, PK 204-08.1, PN G 204.0-08.5, GSC2 N220002316027, UBC 6150, PN YM 28, UBV M 44654, CSI +03-06022 |
The nebula was discovered in 1955 by an American astronomer named George Ogden Abell on the photo plates of the Palomar Observatory Sky Survey (POSS).[5]
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