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Thread: Discussion: Asteroid Found to Match Earth's Orbit

  1. #1
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    SUMMARY: Astronomers have discovered an asteroid in a companion orbit to the Earth. Named 2002 AA29, this 100 metre asteroid was discovered by the linear automated sky survey project in January. Although objects have been found to share the orbits of other planets, none have ever been found for the Earth. You don't have to worry about it hitting the planet, though, as calculations of its orbit have determined that 2002 AA29 will never come closer than 4.5 million kilometres (12 times the distance from the Earth to the moon).


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  2. #2
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    Very interesting object 2002 AA29, and had a quick check of Wiki to find out what they had on it. It really is an amazing orbit around the Earth, I wonder who'll be the first to claim it?

    Asteroid 2002 AA29

    Asteroid 2002 AA29 Orbital Picture

  3. #3
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    It would not be very bright, assuming my dubious calculations are correct.

    For a 100 m dia., 0.2 geo. albedo, at 4.5 million km, the apparent magnitude could be 14.8 (15.9 if 60m in dia.).
    We know time flies, we just can't see its wings.

  4. #4
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    I've got a page on my website about the orbit of 2002 AA29
    http://www.orbitsimulator.com/gravit.../2002aa29.html

  5. #5
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    Thanks. That is very cool!

    That horseshoe orbital pattern you've plotted for a full Earth orbit would make for a beautiful gold chain, too. Much nicer than the Cruithne horseshoe.

    If you find any apparent mag. results, please let us know.
    We know time flies, we just can't see its wings.

  6. #6
    Join Date
    Apr 2004
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    So, does this mean that Earth is not a planet?

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