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| Emission nebula | |
|---|---|
| Planetary nebula | |
Constellation map of Orion
| |
| Observation data: J2000 epoch | |
| Right ascension | 06h02m 21.4s |
| Declination | +09° 39′ 07″ |
| Constellation | Orion |
| Notable features | Obscured by a foreground star |
| Designations | PNG 198.6-06.3
PK 198-06.1 ARO 120 |
| See also: Lists of nebulae | |
Abell 12 is a planetary nebula located in the constellationofOrion. Abell 12 is known as "the hidden planetary" because of the foreground star Mu Orionis making it difficult to observe and Abell 12 being at an apparent magnitude of about 14. The best way for it to be observed is through narrowband filters such as H-alpha and O-III. The nebula is 6,900 light years away from Earth, north of Betelgeuse. Other names for Abell 12 are PNG 198.6-06.3, PK 198-06.1 and ARO 220.[1] The northern outer red hydrogen shell has been ruptured allowing the interior oxygen to spill out.[2]
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