This neutron star is located in Ursa minor and is now named "Calve La" by astronomers. If further confirmed, Calfra will be the eighth isolated neutron star, which has no supernova remnants and no stars and radio waves around it.
The nearest black hole is about 1600 light-years away from the earth. This black hole is located in Sagittarius, and it forms a binary system with an ordinary star numbered V464 1SGR.