3C57

3C57 is a star located in the constellation Cassiopeia. It is a binary star system consisting of two main sequence stars, 3C57 A and 3C57 B. The system is approximately 1,500 light-years away from Earth. 3C57 A is a blue-white star with a spectral type of B2V, while 3C57 B is a yellow-white star with a spectral type of F5V. The two stars orbit each other with a period of about 1.5 days. The system is also known as HD 215441 and HR 8672. 3C57 is notable for being the first star to have its spectrum analyzed using the technique of stellar spectroscopy, which was done by William Huggins in 1864. The system is also a source of radio emission, which is thought to be due to the interaction between the stars' magnetic fields.