1997 xf11 was discovered by jim scotti of the university of arizona in tucson on 6 december last year. gareth williams and brian marsden of the harvard-smithsonian center for astrophysics in cambridge, massachusetts, soon added it to their list of "potentially hazardous objects" which might hit the earth. initial calculations indicated that 1997 xf11 would miss the earth by about 800 000 kilometres in 2028.

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1997 XF11 was discovered by Jim Scotti of the University of Arizona in Tucson on 6 December last year. Gareth Williams and Brian Marsden of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, soon added it to their list of "potentially hazardous objects" which might hit the Earth. Initial calculations indicated that 1997 XF11 would miss the Earth by about 800 000 kilometres in 2028.