CTB1_ The Medulla Nebula

"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.

CTB 1 is an oxygen-rich supernova remnant of mixed morphology, that is, in the radio band it is similar to a hollow shell while in X-rays its structure is compact and centralized. Thus, it shows a complete envelope in both the visible spectrum and the radio band. The uniform envelope—in both wavelength ranges—indicates that the shock wave extends in a relatively homogeneous interstellar medium.

The pulsar PSR J0002+6216 has been proposed to be the stellar remnant of the supernova that caused the formation of CTB 1. Its proper motion is of the correct magnitude and direction to support the relationship between the two objects. The pulsar is moving at high speed (more than 1000 km/s), which may be the result of the primary explosion.

The estimated age of CTB 1 is 10,000 years, although the uncertainty of this value can be as high as 20%. Other studies give it a greater age, around 16,700 years.

On the other hand, there is also no consensus regarding the distance at which this supernova remnant is located. Various publications place it at a distance between 2,000 and 3,100 parsecs, while for others it is at 4,300 ± 200 parsecs. CTB 1 has a radius of approximately 15 parsecs or 49 light years." (Wikipedia)