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  • Unusual Minor Planets

    The lists of unusual objects accessible from this page include both close-approach and distant objects. Note that the definitions of Aten, Apollo and Amor objects differ between different groups. The definitions used here are that: Atens have semimajor axes less than 1.0 AU; Apollos have perihelion distances less than 1.0 AU and semimajor axes greater than 1.0 AU; and Amors have perihelion distances between 1.0 and 1.3 AU. Centaur objects have perihelia beyond the orbit of Jupiter and semimajor axes inside the orbit of Neptune. Transneptunian objects have orbits with semimajor axes beyond the orbit of Neptune--some of these objects, generally assumed to be in librations with Neptune, have perihelion distances inside the orbit of Neptune.

    At the present time, these lists contain entries for the following numbers of objects:

    • 11368 close approach
    • 1681 distant objects
    • 517 other unusual objects
    More specifically:
    • 875 Atens
    • 5635 Apollos
    • 4858 Amors
    • 404 Centaurs and Scattered-Disk Objects
    • 1277 transneptunians

    The close-approacher lists are here:

    The distant-object lists are here (ordered by designation):

    The Trojan lists are here (ordered by designation):

    Here is a list of other unusual objects (sortable table format) that do not fit into any of the above categories.

    The 1500 Potentially Hazardous Asteroids (the minor planets with the greatest potential for close approaches to the earth) (sortable table format) include those objects with H brighter than or equal to V = 22.0 and an Earth MOID (see explanation) less than 0.05 AU.

    This page was last updated on 2014 Sept. 19.