WGNNews.org Posted 8:15 P.M. January 24,
2004By Kenneth Martin
The following table lists the predicted encounters by
Potentially Hazardous Asteroids (PHAs) to within 0.05 AU of
the earth from the start of this year through 2178. Objects with
very uncertain orbits are excluded from this listing, as are
recently discovered objects whose orbits have been computed
without consideration of planetary perturbations. The distances
quoted are from the nominal orbit solutions in the cited
references and can be quite uncertain, particularly for
one-opposition objects. Perturbed orbital solutions consider
perturbations by eight major planets (Mercury to Neptune), three
minor planets (Ceres, Pallas and Vesta) and treat the earth and
the moon as separate perturbing bodies. For comparison, the mean
distance of the moon is 0.0026 AU = 384400 km = 238900 miles. (1
AU is approximately the mean distance of the earth from the sun
= 149597870 km = 92955810 miles.)
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The List of about 800 Potentially Hazardous Asteroids
in the link covers Asteroids from January 2004 A.D. through
2178 A.D.
Mean distance of the earth/moon is 0.0026 AU = 384,400
km = 238,900 miles
Astronomical Unit
1 AU is approximately the mean distance of the earth from
the sun = 149,597,870 km = 92,955,810 miles
0.05 AU = 4,647,790.5 miles = 19.5 x 238,900 miles (
earth to moon )
PHA = Potentially Hazardous Asteroids
