Epsilon Eridani

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High Quality Content by WIKIPEDIA articles! Epsilon Eridani (Iu Eri, Iu Eridani) is a star in the southern constellation Eridanus, along a declination 9.46A(deg) south of the celestial equator. This allows the star to be viewed from most of the Eart…

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    Om Epsilon Eridani

    High Quality Content by WIKIPEDIA articles! Epsilon Eridani (Iu Eri, Iu Eridani) is a star in the southern constellation Eridanus, along a declination 9.46A(deg) south of the celestial equator. This allows the star to be viewed from most of the Earth's surface. At a distance of 10.5 light years (ly), it has an apparent magnitude of 3.73. It is the third closest of the individual stars or star systems visible to the naked eye and is the closest star known to host a planet. Its age is estimated at less than a billion years. Because of its youth, Epsilon Eridani has a higher level of magnetic activity than the present-day Sun, with a stellar wind 30 times as strong. Its rotation period is 11.2 days at the equator. Epsilon Eridani is smaller and less massive than the Sun, and has a comparatively lower level of elements heavier than helium. Astronomers categorize it as a main-sequence star of spectral class K2, which means that energy generated at the core through nuclear fusion of hydrogen is emitted from the surface at a temperature of about 5,000 K, giving the star an orange hue.

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    Detaljer

    Format
    E-Bok
    Filformat
    ePUB
    Forlag
    BookOnDemand
    Språk
    Engelsk
    ISBN
    9785510106190
    Sider
    262

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