80P/Peters–Hartley
| Discovery | |
|---|---|
| Discovered by | Christian H. F. Peters Malcolm Hartley |
| Discovery site | Capodimonte Observatory, Italy |
| Discovery date | 26 June 1846 11 July 1982 |
| Designations | |
| P/1846 M1 P/1982 N1 | |
| |
| Orbital characteristics | |
| Epoch | 21 November 2025 (JD 2461000.5) |
| Observation arc | 177.15 years |
| Number of observations | 186 |
| Aphelion | 6.424 AU |
| Perihelion | 1.618 AU |
| Semi-major axis | 4.021 AU |
| Eccentricity | 0.59769 |
| Orbital period | 8.063 years |
| Inclination | 29.928° |
| 259.77° | |
| Argument of periapsis | 339.26° |
| Mean anomaly | 131.89° |
| Last perihelion | 8 December 2022 |
| Next perihelion | 28 December 2030 |
| TJupiter | 2.513 |
| Earth MOID | 0.619 AU |
| Jupiter MOID | 0.454 AU |
| Comet total magnitude (M1) | 11.8 |
80P/Peters–Hartley is a Jupiter-family comet with an orbital period of 8.06 years around the Sun. It is the first of two comets discovered by German–American astronomer, Christian Heinrich Friedrich Peters, later becoming lost and subsequently recovered by Australian astronomer, Malcolm Hartley.