489P/Denning
< 489P
The comet on 30 March 1894 by Max Wolf | |
| Discovery | |
|---|---|
| Discovered by | William F. Denning |
| Discovery site | Bristol, England |
| Discovery date | March 26, 1894 |
| Designations | |
| D/1894 F1 P/2007 HE4 | |
| 1894 I, 1894a | |
| Orbital characteristics | |
| Epoch | 18 August 2002 (JD 2452504.5) |
| Observation arc | 113.14 years |
| Number of observations | 302 |
| Aphelion | 7.312 AU |
| Perihelion | 1.575 AU |
| Semi-major axis | 4.443 AU |
| Eccentricity | 0.6456 |
| Orbital period | 9.37 years |
| Inclination | 4.007° |
| 22.579° | |
| Argument of periapsis | 107.96° |
| Mean anomaly | 180.38° |
| Last perihelion | 2 September 2016 |
| Next perihelion | 4 December 2025 |
| TJupiter | 2.579 |
| Earth MOID | 0.596 AU |
| Jupiter MOID | 0.065 AU |
| Comet total magnitude (M1) | 7.6 |
489P/Denning is a Jupiter-family comet with an orbital period of 9.4 years. It was discovered by William Frederick Denning on 26 March 1894 but was subsequently lost until 2024, when asteroid 2007 HE4 was identified as the same object.