- ^ "89P/Russell 2". Retrieved 15 April 2015.
- ^ "89P/Russell Orbit". Minor Planet Center. Retrieved 2017-04-07.
- ^ "86P/Russell 2". Gary Kronk. Retrieved 15 April 2015.
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| Discovery | |
|---|---|
| Discovered by | K. S. Russell at Siding Spring Observatory, New South Wales, Australia |
| Discovery date | 28 September 1980 |
| Orbital characteristics | |
| Epoch | 27 June 2015 |
| Aphelion | 5.281 AU |
| Perihelion | 2.2236 AU |
| Semi-major axis | 3.7566 AU |
| Eccentricity | 0.4081 |
| Orbital period | 7.26 yr |
| Inclination | 12.06° |
| Last perihelion | 14 December 2016[1] |
| Next perihelion | 2024-Mar-26[2] |
89P/Russell is a periodic comet in the Solar System with a current orbital period of 7.28 years.[3]
It was discovered on a photographic plate by Kenneth Russell of Siding Spring Observatory in New South Wales, Australia on 28 September 1980. Brightness was estimated at a magnitude of 17. The elliptical orbit calculated by Brian G. Marsden gave a perihelion date of 19 May 1980 and an orbital period of 7.12 years.
It has been observed on each subsequent apparition, most recently in 2009. The next perihelion is computed as 14 December 2016.