31P/Schwassmann–Wachmann, also known as Schwassmann–Wachmann 2, is a periodic comet in the Solar System. It was discovered on 17 January 1929, at an apparent magnitude of 11. (Cometography Home Page) The comet has been seen at every apparition.
The comet nucleus is estimated to be in diameter. In 1929, the astronomer Anne Sewell Young identified the comet with an object that had been misidentified as the minor planet "Adelaide" (A904 EB).
References
External links
at the Minor Planet Center database 31P/Schwassmann–Wachmann at Kazuo Kinoshita's Comets 31P/Schwassmann-Wachmann at Seiichi Yoshida's website