C/1967 Y1 (Ikeya–Seki)

For the 1965 comet of the same name, see Comet Ikeya–Seki.
For other comets discovered by Kaoru Ikeya and Tsutomu Seki, see Comet Ikeya and Comet Seki.
C/1967 Y1 (Ikeya–Seki)
Discovery
Discovered byKaoru Ikeya
Tsutomu Seki
Discovery siteJapan
Discovery date28 December 1967
Designations
1968 I, 1967n
Orbital characteristics
Epoch18 March 1968 (JD 2439933.5)
Observation arc676 days (1.85 years)
Number of
observations		300
Aphelion4,020 AU
Perihelion1.697 AU
Semi-major axis2,011 AU
Eccentricity0.99916
Orbital period90,185 years
Inclination129.315°
255.321°
Argument of
periapsis		70.864°
Last perihelion25 February 1968
TJupiter–1.02
Earth MOID1.0675 AU
Jupiter MOID0.0276 AU
Physical characteristics
Comet total
magnitude (M1)		4.0
6.3
(1968 apparition)

Comet Ikeya-Seki, formally designated as C/1967 Y1, is a retrograde non-periodic comet discovered by Kaoru Ikeya and Tsutomu Seki on 1967. It is the second comet discovered by the two Japanese astronomers after C/1965 S1.

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