123P/West–Hartley
< 123P
Discovery image of Comet West–Hartley taken from ESO on 11 May 1989. | |
| Discovery | |
|---|---|
| Discovered by | Richard M. West Malcolm Hartley |
| Discovery site | European Southern Observatory |
| Discovery date | 11 May 1989 |
| Designations | |
| P/1989 E3, P/1995 S2 | |
| 1988 XVI, 1989k | |
| Orbital characteristics | |
| Epoch | 7 October 2026 (JD 2461320.5) |
| Observation arc | 30.39 years |
| Number of observations | 4,399 |
| Aphelion | 5.616 AU |
| Perihelion | 2.159 AU |
| Semi-major axis | 3.887 AU |
| Eccentricity | 0.44469 |
| Orbital period | 7.665 years |
| Inclination | 15.281° |
| 45.848° | |
| Argument of periapsis | 103.88° |
| Mean anomaly | 1.945° |
| Last perihelion | 5 February 2019 |
| Next perihelion | 21 September 2026 |
| TJupiter | 2.832 |
| Earth MOID | 1.197 AU |
| Jupiter MOID | 0.704 AU |
| Physical characteristics | |
Mean radius | 2.18±0.23 km |
| 3.7 hours | |
| Comet total magnitude (M1) | 8.2 |
| Comet nuclear magnitude (M2) | 13.8 |
Comet West–Hartley is a periodic comet with a 7.67-year orbit around the Sun.