Named for the U.S. astronomer Jermain Gildersleeve Porter (1852–1933), Director of the Cincinnati Observatory from 1884 to 1930 and well known for his work on star positions. Also named for John Guy Porter (1900–1981), for many years principal scientific officer at H.M. Nautical Almanac Office, Director of the Computing Section of the British Astronomical Association, and well-known popularizer of astronomy. Both J. G. Porters have contributed extensively to the astronomy of comets and minor planets, the first one as an observer, the second as a computer and a compiler of a catalogue of cometary orbits. (M 3932) _ _.