Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nyasa.822...52m&link_type=abstract
Near-Earth Objects, the United Nations International Conference: Proceedings of the international conference held April 24-26, 1
Astronomy and Astrophysics
Astronomy
2
Orbital Mechanics, Asteroids, Comets, Hazards, Astrometry, Solar Orbits, Solar System
Scientific paper
After a brief summary of the distribution of both large and small bodies in the solar system, there follows a categorization of the various hazards from comets and asteroids, the concept of PHA, or 'potentially hazardous asteroid,' being introduced to include one that is large enough and can pass close enough to the Earth's orbit that it might conceivably yield a globally-damaging impact in the forseeable future. Future search strategies are discussed, as they involve increasing both sky coverage and faintness limit, arguments being given for ensuring much fainter detections in the general opposition region than at much smaller elongations. It is concluded that a proposed 'impact hazard scale' is generally less useful than recognition of the PHA status. The current situation with regard to follow-up astrometric activity, particularly by amateur astronomers, is viewed favorably, but professional search activity is at a depressingly low level.
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