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Thread: Incredible rate of discovery of Near Earth Asteroids

  1. #1 Incredible rate of discovery of Near Earth Asteroids 
    Comet Dust Collector Moderator
    Join Date
    Mar 2011
    New Jersey, USA
    Results now in for 12 months ending May 1st. For each catergory, Listed is 12 month total and [total known]

    Near Earth Objects, 1018 [8324]

    These included 2 Near Earth Comets [87]
    1016 Near Earth Asteroids [7937]

    Of the NEA's
    => 1 km, 14 [827]
    PHA's 104 [1222]
    Of the PHA's
    => 1 km, only 1 this year [148]

    Of the NEA's
    Apollos 568 [4324]
    Amors 351 [2946]
    Atens 96 [656]
    Atiras 1 [11]

    Group Description Definition

    NECs Near-Earth Comets q<1.3 AU, P<200 years

    NEAs Near-Earth Asteroids q<1.3 AU

    Atiras NEAs whose orbits are contained entirely with the orbit of the Earth (named after asteroid 163693 Atira). a<1.0 AU, Q<0.983 AU

    Atens Earth-crossing NEAs with semi-major axes smaller than Earth's (named after asteroid 2062 Aten). a<1.0 AU, Q>0.983 AU

    Apollos Earth-crossing NEAs with semi-major axes larger than Earth's (named after asteroid 1862 Apollo). a>1.0 AU, q<1.017 AU

    Amors Earth-approaching NEAs with orbits exterior to Earth's but interior to Mars' (named after asteroid 1221 Amor). a>1.0 AU, 1.017<q<1.3 AU

    PHAs Potentially Hazardous Asteriods: NEAs whose Minimum Orbit Intersection Distance (MOID) with the Earth is 0.05 AU or less and whose absolute magnitude (H) is 22.0 or brighter. MOID<=0.05 AU, H<=22.0

    All data from JPL Sentry System Discovery Page:

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