Discovery of Sedna

Date: November 14, 2003 • Location: Washington, United States

Astronomers Michael E. Brown, Chad Trujillo, and David L. Rabinowitz discovered the trans-Neptunian object Sedna.

Michael E. Brown is an American astronomer, who has been professor of planetary astronomy at the California Institute of Technology (Caltech) since 2003. His team has discovered many trans-Neptunian objects (TNOs), including the dwarf planet Eris, which was originally thought to be bigger than Pluto, triggering a debate on the definition of a planet.