Research on activity histories of parent comets and asteroids of meteor showers with Dust Trail theory

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A new method to investigate the history of activities of parent comets or asteroids by using related meteor shower activities was developed, and applied to actual examples(Orionid meteor shower and Comet Halley, June Bootids meteor shower and and Comet Pons-Winnecke, October Draconids and comet Giacobini-Zinner). Several candidates of the dead-comets, which may have related meteor showers, have been picked up among the Near-Earth asteroids, and investigated. As a result, asteroid 2003WY25 has been identified as the parent object of Phoenicid meteor shower, and thought to be a dead comet. It is thought to have a cometary activity in 18^<th> century, but、but its activity should have been decreased in the 19^<th> century by our study. The future activities of the Phoenicids was also calculated, and actually observed by high-sensitivity video camera developed in this research.