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D.J. Asher, Research Fellow

David Asher continued to work part time at Armagh Observatory and part time at the Bisei Spaceguard Center in Japan. At Bisei his main contribution was to develop and improve the software for the automatic detection and position measurement of asteroids and comets, as part of the system that surveys the sky to find such objects.

Among his research at Armagh was work in collaboration with Sandra Jeffers (University of St. Andrews) on long term cratering rates on asteroids (Jeffers & Asher 2003). The study focused on calculating, from theory, the crater distributions expected on asteroids that have been imaged by spacecraft and for which observational data are therefore available for comparison. It was shown how cratering timescales vary depending on asteroids' dynamical history and the part of the terrestrial planet region that they occupy.

With the most spectacular Leonid meteor displays of recent years now over, the Leonid meteor shower still continued to hold people's interest, with a modestly enhanced display visible in 2003 from parts of the world. Asher continued to provide detailed information on meteor predictions to professional and amateur astronomers, the media, and others requesting it. The paper by Vaubaillon et al. (2003) analysed the similarities and differences among the three main meteor stream modelling techniques to have emerged in recent years, and provided models for the 2003 shower. Asher also wrote an article on meteor storms for the 2003 McGraw-Hill Yearbook of Science & Technology.

David Asher continued on the Scientific Organising Committee of IAU Commission 22 (Meteors, Meteorites and Interplanetary Dust) and as a member of the IAU Working Group on Near-Earth Objects. He remained a Council Member of the IMO (International Meteor Organization) and on the Editorial Board of WGN, the IMO's journal.