1955 RZ. Discovered 1955 Sept. 14 at the Goethe Link Observatory at Brooklyn, Indiana.

Named in honor of Riccardo Giacconi {1931- }, since 1981 the first director of the Space Telescope Science Institute. After serving as a research associate in the cosmic-ray physics group at Indiana University, and then briefly at Princeton, in 1959 he joined American Science and Engineering, where he began work on X-ray astronomy. His team there developed grazing-incidence X-ray telescopes, and in 1962 they discovered Sco X-1, the first known X-ray source outside the solar system. This was followed by the orbiting X-ray observatory UHURU, which made the first surveys of the X-ray sky. Joining the Harvard-Smithsonian Center for Astrophysics in 1973 as associate director for high-energy physics, Giacconi led the construction and successful operation of the powerful X-ray observatory HEAO-2, also known as Einstein, which made detailed images of X-ray sources. (M 16884)

Name proposed by F. K. Edmondson. Citation prepared with the help of J. Tenn. Giacconi received the Nobel prize for physics 2002.

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