139P/Väisälä–Oterma
Comet
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. Wikipedia
Orbital period: 3,495 days
Discovered: October 7, 1939
Orbits: Sun
Discoverers: Yrjö Väisälä and Liisi Oterma