| Discovery | |
|---|---|
| Discovered by: | Yrjö Väisälä Liisi Oterma |
| Discovery date: | October 7, 1939 |
| Alternate designations: | 1939 TN; 1998 WG22 |
| Orbital characteristics A | |
| 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: | April 19, 2008 |
| Next perihelion: | December 10, 2017 |
139P/Väisälä-Oterma is a periodic comet in our solar system. When it as discovered in 1939 it was not recognized as a comet and designated as asteroid 1939 TN.
| Periodic comets (by number) | ||
|---|---|---|
| Previous 138P/Shoemaker-Levy |
139P/Väisälä–Oterma | Next 140P/Bowell-Skiff |