C/1967 Y1 (Ikeya–Seki)
< C
| Discovery | |
|---|---|
| Discovered by | Kaoru Ikeya Tsutomu Seki |
| Discovery site | Japan |
| Discovery date | 28 December 1967 |
| Designations | |
| 1967n 1968 I | |
| Orbital characteristics | |
| Epoch | 18 March 1968 (JD 2439933.5) |
| Observation arc | 676 days (1.85 years) |
| Number of observations | 197 |
| Aphelion | 4,020 AU |
| Perihelion | 1.697 AU |
| Semi-major axis | 2,011 AU |
| Eccentricity | 0.99916 |
| Orbital period | 90,185 years |
| Inclination | 129.315° |
| 255.321° | |
| Argument of periapsis | 70.864° |
| Last perihelion | 25 February 1968 |
| TJupiter | –1.02 |
| Earth MOID | 1.0675 AU |
| Jupiter MOID | 0.0276 AU |
| Physical characteristics | |
| Comet total magnitude (M1) | 4.0 |
| 6.7 (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 together by the two Japanese astronomers after C/1965 S1.