[4] He also identified the earliest known observation of a Jupiter trojan, when he linked A904 RD, an object seen on a single night in 1904 by E. E. Barnard, with (12126) 1999 RM11.
[5] Barnard's observations, which he initially believed belonged to Saturn IX (Phoebe), were sufficient to show that the object was distant, but he did not follow it up.
[6][failed verification] On 11 February 2020, the Minor Planet Center announced that Gareth Williams is retiring as its associate director.
[3] Minor planet 3202 Graff, a Hilda asteroid discovered by Max Wolf at Heidelberg in 1908, was named in his honor on 10 April 1990 (M.P.C.
[1][7] The outer main belt asteroid 10257 Garecynthia was also named in honor of his marriage with Cynthia Marsden, daughter of former MPC director Brian G.