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Perseid Meteor Shower

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    #2
    lord lucan
    Registered Users Posts: 9,576 ✭✭✭lord lucan


    That Joshua Tree National Park video is absolutely stunning!


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    #3
    WolfeIRE
    Closed Accounts Posts: 2,667 ✭✭✭WolfeIRE


    Asteroid Discovery From 1980 - 2010

    Astronomer and programmer Scott Manley, formerly of the Armagh Observatory in Northern Ireland, has created a movie showing 30 years of asteroid discoveries in only 3 minutes. Warning: Feelings of claustrophobia have been reported among some viewers. It's crowded out there!

    https://www.youtube.com/watch?v=S_d-gs0WoUw


    "View of the solar system showing the locations of all the asteroids starting in 1980, as asteroids are discovered they are added to the map and highlighted white so you can pick out the new ones.
    The final colour of an asteroids indicates how closely it comes to the inner solar system.
    Earth Crossers are Red
    Earth Approachers (Perihelion less than 1.3AU) are Yellow
    All Others are Green

    Notice now the pattern of discovery follows the Earth around its orbit, most discoveries are made in the region directly opposite the Sun. You'll also notice some clusters of discoveries on the line between Earth and Jupiter, these are the result of surveys looking for Jovian moons. Similar clusters of discoveries can be tied to the other outer planets, but those are not visible in this video.

    As the video moves into the mid 1990's we see much higher discovery rates as automated sky scanning systems come online. Most of the surveys are imaging the sky directly opposite the sun and you'll see a region of high discovery rates aligned in this manner.

    At the beginning of 2010 a new discovery pattern becomes evident, with discovery zones in a line perpendicular to the Sun-Earth vector. These new observations are the result of the WISE (Widefield Infrared Survey Explorer) which is a space mission that's tasked with imaging the entire sky in infrared wavelengths.

    Currently we have observed over half a million minor planets, and the discovery rates snow no sign that we're running out of undiscovered objects."


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