Brian Mardsen, director of the...
Brian Mardsen, director of the Central Bureau for Astronomical Telegrams at the
Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, released the
results of an 88-day study of 1997 XF11, an asteroid that circles the sun every 21 months.
He predicted that the mile-wide hunk of primeval rock might hit the earth on October 26,
2028. (The rock was first discovered by University of Arizona astronomers December 6,
1997.) However, Eleanor Helin, an asteroid specialist at NASA's Jet Propulsion
Laboratory in Pasadena, California, began researching thousands of photos of 1997 XF11