40P/Väisälä 1 (Vaisala)
Discovered by
Yrjö Väisälä
Discovery date
08 February 1939
Alternative designations
1939 IV, 1949 V, 1960 IV, 1971 VII, 1982 V, 1993 VIII
Semi-major axis
4.8925 AU
Orbital period
23 August, 2004
7.9890 AU
1.7960 AU
Last Perihelion(s)
15 November 2014
Next Perihelion
12 November 2025

Close Approaches

Orbit of 40P/Väisälä, which crosses the orbit of Jupiter and is frequently gravitationally perturbed

The orbit of Comet Väisälä resembles that of many centaurs, and is therefore unstable over thousands of years due to gravitational interactions with the gas giant Jupiter. One such close approach, 0.41 AU in December 31, 1961, increased its perihelion distance from 1.74 AU to 1.87 AU and increased its orbital period from 10.46 to 11.28 years. On September 21, 1973, an approach of Jupiter 1 AU away decreased perihelion distance from 1.87 AU to 1.80 AU decreased orbital period from 11.28 to 10.88 years. Väisälä will make one more close approach in the 21st century, but it will have a minimal effect. However, in the year 2127, the comet will make a close approach of only 0.096 AU from Jupiter, and reduce perihelion to 1.4 AU.

Last modified
11/12/2016 - 08:32