139P/Väisälä–Oterma
Periodic comet with 9 year orbit From Wikipedia, the free encyclopedia
139P/Väisälä–Oterma is a periodic comet in the Solar System. When it was discovered in 1939 it was not recognized as a comet and designated as asteroid 1939 TN.
| Discovery | |
|---|---|
| Discovered by | Yrjö Väisälä Liisi Oterma |
| Discovery date | October 7, 1939 |
| Designations | |
| 1939 TN; 1998 WG22 | |
| Orbital characteristics | |
| Epoch | March 6, 2006 |
| Aphelion | 5.62 AU |
| Perihelion | 3.402 AU |
| Semi-major axis | 4.511 AU |
| Eccentricity | 0.2458 |
| Orbital period | 9.58 a |
| Inclination | 2.3296° |
| Last perihelion | December 10, 2017 April 19, 2008 |
| Next perihelion | 2027-Jul-23[1] |
References
External links
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