Medusa Nebula
| Nebula | |
|---|---|
| File:No image. | |
| Observation data: J2000.0 epoch | |
| Right ascension | 07h 29.3m |
| Declination | +13° 14′ |
| Distance | 1000 ly ly |
| Apparent magnitude (V) | +11.3 |
| Apparent dimensions (V) | 10.2 arcmin |
| Constellation | Gemini |
| Physical characteristics | |
| Radius | ? ly |
| Notable features | Very large and very low surface brightness |
| Designations | Abell 21, PK205+14.1, ARO 388 |
The Medusa Nebula is a very old and large planetary nebula in the constellation of Gemini on the Canis Minor border. As it is so big, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. Because of this most websites recommend at least an 8-inch telescope with an OIII filter to find this object although probably possible to image with smaller apertures.