perihelion distance

perihelion distance

The distance from the Sun to the perihelion of a body in an elliptical orbit, or from the focus of a parabolic trajectory around the Sun to the vertex.
References in periodicals archive ?
Its perihelion distance is so small that there are very few comparable objects on which to base predictions.
0 18 The date of perihelion (T), perihelion distance (q), period (P), the number of previously observed returns (N), the magnitude parameters [H.
After perihelion distance, you will see the separate nuclei gradually drifting apart.
At such a close perihelion distance from the Sun, sungrazers are expected to be intensely heated by the Sun, and sublimate not only ice but also silicates and even metals, releasing a tremendous amount of dust.
8au) in 1972, before which the P/2001 J1 perihelion distance was 0.
Since Comet 1973f has a perihelion distance that is only about a quarter that of Comet Bennett, it should become much brighter; and if it develops a dust tail, it could be the most spectacular comet of the century.
05 au) with Jupiter in 1959, which reduced the perihelion distance from 2.
It appears to have been a relatively ordinary Apollo asteroid having a perihelion distance of 0.
One clue to what triggered the outburst this time around--and not, say, when Comet Holmes last came near the Sun in 1999--may be its vacillating perihelion distance.
One D/ [destroyed, or disappeared] comet has predictions for a return, though searches at favourable returns in the intervening period have failed to reveal the comet and its orbit has been perturbed by Jupiter to give a larger perihelion distance.
They propose that the Marsden and Kracht groups are fragments that separated from Comet Machholz about 4,000 years ago, when that comet's perihelion distance was near its minimum.