Correction effect to the dispersion of radiant point in case of low velocity meteor showers

摘要

Meteor showers are recognized from the concentration of their radiant distribution on the celestial sphere, and their similar speeds. It has been pointed out that the dispersion of the radiants depends on the velocity of and the spread in velocities between individual stream meteoroids. For meteor showers with low speeds at the Earth, the dispersion can become so large that the shower becomes hard to recognize (Sato and Watanabe, 2014). In this paper, we apply a technique described in Sato and Watanabe (2014) which transforms radiants from a geocentric to a heliocentric frame. The technique is applied to detect two low speed meteor showers, the Phoenicids and the June Bootids, which otherwise would be very difficult to recognize as true meteor showers.