Named in memory of Kiyotsugu Hirayama (1874-1943), discoverer of the so-called Hirayama families of minor planets. Hirayama is also honored by a lunar crater.

Professor Hirayama, of the Astronomical Observatory, Tokyo, was elected a Corresponding Fellow of the Royal Astronomical Society of Canada on 1907-10-01.

Orbit type: Main Belt Asteroid 

Reference: M 4237

Sherburne Wesley Burnham (December 12, 1838 – March 11, 1921) was an American astronomer. His parents were Roswell O. and Marinda (née Foote) Burnham.

He worked at Yerkes Observatory. All his working life, he served during the day as a court reporter and was an amateur astronomer, except for four years as a full-time astronomer at Lick Observatory.

Herbert Hall Turner (13 August 1861, Leeds – 20 August 1930, Stockholm) was a British astronomer and seismologist.

Herbert Hall Turner was educated at Clifton College and Trinity College, Cambridge. In 1884 he accepted the post of Chief Assistant at Greenwich Observatory and stayed there for nine years. In 1893 he became Savilian Professor of Astronomy and Director of the Observatory at Oxford University, a post he held for 37 years until his sudden death in 1930.

Percival Lawrence Lowell (March 13, 1855 – November 12, 1916) was an American businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars, founded the Lowell Observatory in Flagstaff, Arizona, and formed the beginning of the effort that led to the discovery of Pluto fourteen years after his death. The choice of the name Pluto and its symbol were partly influenced by his initials PL.

Sir Frank Watson Dyson, KBE, FRS (8 January 1868 – 25 May 1939) was an English astronomer and Astronomer Royal who is remembered today largely for introducing time signals ("pips") from Greenwich, England, and for the role he played in testing Einstein's theory of general relativity.

Johan Oskar Backlund (April 28, 1846 – August 29, 1916) was a Swedish-Russian astronomer. His name is sometimes given as Jöns Oskar Backlund, however even contemporary Swedish sources give "Johan". In Russia, where he spent his entire career, he is known as Oskar Andreevich Baklund (Оскар Андреевич Баклунд). Russian sources sometimes give his dates of birth and death as April 16, 1846 and August 16, 1916, in the Julian calendar that was used in Russia during that period.

Donald Ross Moorcroft (1935-2015) is a Canadian physicist who did much to advance the field of radar backscatter from the auroral E-region ionosphere. He was the Chair of the Department of Physics of the University of Western Ontario from 1989 to 1998.

Orbit type: Main Belt

Reference: MPC 83584