During the 2004 perihelion passage the comet brightened to about apparent magnitude 11.[7] The comet was not observed during the 2011 unfavorable apparition since the perihelion passage occurred when the comet was on the far side of the Sun. During the 2023 apparition it brightened to 8th magnitude.[8]
On 2049 April 1 the comet will pass about 0.016 AU (2,400,000 km; 1,500,000 mi) from Mars.[6]
62P/Tsuchinshan closest Mars approach on 2049-Apr-01[6]