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Asteroid close approaches: analysis and potential impact detection

A. Milani1, S. Chesley2, P. Chudas2, G. Valsecchi3

1Dipartamento di Mathematica, Universita di Pisa, Pisa, Italy
2Jet Propulsion Laboratory, California Institute of Technology, USA
3IAS-CNR, Roma, Italy

The last ten years have seen tremendous progress in our ability to
assess the risk that an asteroid or comet might collide with the Earth.
The catalyst for much of the increased interest in these Near-Earth
Objects (NEOs) was a request by the U.S. Congress in 1990 that NASA
undertake two workshop studies, one to study ways of increasing the
discovery rate of these objects, and another to study the technologies
and options for deflecting or destroying an NEO if it should be found to
pose a danger to life on Earth. The report from the first of these
workshops proposed an international NEO survey program called Spaceguard,
borrowing the name from a similar project in sir Arthur C. Clark's
science fiction novel Rendezvous with Rama [1].

List of references

1) The Space guard Survey // In: Report of the NASA International Near-
Earth-Object Detection Workshop (Morrison D., ed.). - Pasadena: Jet
Propulsion Laboratory, 1992.
2) Bowell E., Muinonen K. Earth-crossing asteroids and comets:
Groundbased search strategies // In: Hazards due to comets and
asteroids (Gehrels T., ed.). - Tucson: Univ. Arizona Press, 1994. -
P. 149-197.
3) Milani A, Chesley S. R., Valsecchi G.B. Asteroid close encounters with
the Earth: Risk assessment // Planetary Space Sciences. - 2000. -
V. 48. - P. 945-954.