CTB 1
| Event type | Supernova remnant |
|---|---|
| Type II (?) | |
| Constellation | Cassiopeia |
| Right ascension | 23h 59m 13s |
| Declination | 62°26′ |
| Epoch | J2000 |
| Galactic coordinates | G116.93−00.17 |
| Distance | ~4,300 parsecs |
| Remnant | PSR J0002+6216 |
| Progenitor | 13 - 15 M☉ |
| Notable features | Interaction with a molecular cloud |
| Related media on Commons | |
CTB 1, also known as G116.9+00.1 and AJG 110, nicknamed the Medulla Nebula, is a supernova remnant located in the constellation Cassiopeia. It was discovered as a radio source in 1960 in a study of galactic radiation carried out at a frequency of 960 MHz.