title: 139P/Väisälä–Oterma
text: 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.
  
  References
  
  External links 
   Orbital simulation from JPL (Java) / Horizons Ephemeris
   139P/Vaisala-Oterma – Seiichi Yoshida @ aerith.net
  139P at Kronk's Cometography
  
  Periodic comets
  0139
  Discoveries by Liisi Oterma
  +
  Comets in 2017
  19391007