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.

139P/Väisälä–Oterma
Discovery
Discovered byYrjö Väisälä
Liisi Oterma
Discovery dateOctober 7, 1939
Alternative
designations
1939 TN; 1998 WG22
Orbital characteristics A
EpochMarch 6, 2006
Aphelion5.62 AU
Perihelion3.402 AU
Semi-major axis4.511 AU
Eccentricity0.2458
Orbital period9.58 a
Inclination2.3296°
Last perihelionDecember 10, 2017
April 19, 2008
Next perihelion2027-Jul-23[1]

ReferencesEdit

External linksEdit

Numbered comets
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138P/Shoemaker–Levy
139P/Väisälä–Oterma Next
140P/Bowell–Skiff