Comet Ikeya–Seki
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There are two comets named Ikeya–Seki: C/1965 S1, and C/1967 Y1, a.k.a. 1968 I, 1967n.
Comet Ikeya–Seki, formally designated C/1965 S1, 1965 VIII, and 1965f, was a long-period comet discovered independently by Kaoru Ikeya and Tsutomu Seki. Wikipedia
Discovered: September 18, 1965
Last perihelion: October 21, 1965
Discoverers: Tsutomu Seki and Kaoru Ikeya
Discovered by: Kaoru Ikeya and Tsutomu Seki
Eccentricity: 0.999915 (A); 0.999925 (B)
Orbital period: 795 years (epoch 2200 for A); 946 years (epoch 2200 for B)
Perihelion: 0.007786 AU (A); 0.007778 AU (B)