The change was slight, but it would increase her perihelion distance by ten million kilometres.

By 2195 it will have a perihelion distance of 6 AU.

Its perihelion distance was just 1.3 solar radii.

With a perihelion distance (closest approach to the Sun) of 1.5 AU, this comet does not make close approaches to the Earth.

Recently discovered 2008 QD4 has a smaller perihelion distance.

Comet Halley would be magnitude 1.0 at the same perihelion distance.

Also, among currently known comets there is a bias favoring those with short perihelion distances.

The 1935 approach was observed though not as favourable, in 1937 the comet passed close to Jupiter which increased the perihelion distance and orbital period.

A close pass by Jupiter in 1939 decreased the perihelion distance and orbital period.

The perihelion distance from the sun, which settled the precise form of the parabola.