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The smallest semi-major axis is that of , at 0.642 AU (its Eccentricity of 0.688 takes it from a perihelion of 0.200 AU, well within Mercury 's orbit, to an aphelion of 1.084 AU), although seems to have an even smaller one (0.635 AU; eccentricity 0.532 ranging from 0.297 to 0.973 AU —enough to cross Venus ' orbit but not Mercury's). For a brief time near the end of 2004 , the asteroid 99942 Apophis (then known only by its Provisional Designation ) appeared to pose a threat of causing an Earth Impact Event in 2029 , but earlier observations were found that eliminated that possibility, although a very small possibility remains for 2036 . SEE ALSO EXTERNAL LINKS |
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