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    ancient North Star undergoes Eclipses tagged posts

    Surprise! TESS shows ancient North Star undergoes Eclipses

    January 9, 2020, Categories  Astronomy/Space

    TESS image with Alpha Draconis circled
    The star Alpha Draconis (circled), also known as Thuban, has long been known to be a binary system. Now data from NASA’s TESS show its two stars undergo mutual eclipses. Credit: NASA/MIT/TESS

    NASA’s Transiting Exoplanet Survey Satellite (TESS) have shown that Alpha Draconis, a well-studied star visible to the naked eye, and its fainter companion star regularly eclipse each other. While astronomers previously knew this was a binary system, the mutual eclipses came as a complete surprise.

    “The first question that comes to mind is ‘how did we miss this?'” said Angela Kochoska, a postdoctoral researcher at Villanova University in Pennsylvania who presented the findings at the 235th meeting of the American Astronomical Society in Honolulu on Jan. 6...

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