R. Brent Tully

Richard Brent Tully (born March 9, 1943 in Toronto, Canada) is an astronomer at the Institute for Astronomy in Honolulu, Hawaii.

Tully's specialty is the astrophysics of galaxies. With J. Richard Fisher, he proposed the Tully–Fisher relation, which shows that the luminosity of a galaxy and the orbital velocities of its stars are correlated. He also published the book The Nearby Galaxies Catalog in 1988 with 3D locations for the closest 68,000 galaxies to Earth. These data form a cube of galaxies within an area of 700 million light years centered on Earth. A visual navigable representation of this index can be found in the planetarium computer software Starry Night Pro, where the data is called the Tully Database. Within this database is the Pisces-Cetus Supercluster Complex.