Asteroid 1950 DA's encounter with earth in 2880: Physical limits of collision probabitity prediction

J. D. Giorgini, S. J. Ostro, L. A.M. Benner, P. W. Chodas, S. R. Chesley, R. S. Hudson, M. C. Nolan, A. R. Klemola, E. M. Standish, R. F. Jurgens, R. Rose, A. B. Chamberlin, D. K. Yeomans, J. L. Margot

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

Integration of the orbit of asteroid (29075) 1950 DA, which is based on radar and optical measurements spanning 51 years, reveals a 20-minute interval in March 2880 when there could be a nonnegligible probability of the 1-kilometer object colliding with Earth. Trajectory knowledge remains accurate until then because of extensive astrometric data, an inclined orbit geometry that reduces in-plane perturbations, and an orbit uncertainty space modulated by gravitational resonance. The approach distance uncertainty in 2880 is determined primarily by uncertainty in the accelerations arising from thermal re-radiation of solar energy absorbed by the asteroid. Those accelerations depend on the spin axis, composition, and surface properties of the asteroid, so that refining the collision probability may require direct inspection by a spacecraft.

Original languageEnglish (US)
Pages (from-to)132-136
Number of pages5
JournalScience
Volume296
Issue number5565
DOIs
StatePublished - Apr 5 2002
Externally publishedYes

ASJC Scopus subject areas

  • General

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