| Emission nebula | |
|---|---|
| Planetary nebula | |
NGC 7139 | |
| Observation data: J2000 epoch | |
| Right ascension | 21h 46m 08.586s |
| Declination | +63° 47′ 29.45″ |
| Apparent magnitude (V) | 13 |
| Constellation | Cepheus |
NGC 7139 is a planetary nebula located in the constellation of Cepheus. It was discovered on November 5, 1787, by astronomer William Herschel.