Cometcountdown

139P/Vaisala-Oterma
Discovered by
Yrjö Väisälä
Liisi Oterma
Discovery date
7 October 1939
Alternative designations
1939 TN; 1998 WG22
Semi-major axis
4.511 AU
Eccentricity
0.2458
Orbital period
9.58 a
Inclination
2.3296°
Epoch
6 March 2006
Aphelion
5.62 AU
Perihelion
3.402 AU
Last Perihelion(s)
19 April 2008
Next Perihelion
10 December 2017
Last modified
23/12/2016 - 10:51