SDSS J1229+1122
Until the discovery of the doubly gravitationally lensed MACS J1149 Lensed Star 1 (also known as Icarus) in 2018, SDSS J1229+1122 was the most distant-known star, at  (stars more distant than this are only known through events that they cause, such as stellar explosions of supernovae and gamma ray bursts). (The record for the most distant star is, as of June 2017, a strongly lensed star at redshift 1.5 behind the galaxy cluster MACS1149.) The discovery was made by Drs. Youichi Ohyama and Ananda Hota, using the Subaru Telescope.