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Thread: TESS Just Found its First Earth-Sized World

  1. #1
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    TESS Just Found its First Earth-Sized World

    NASA’s new planet-hunting telescope, TESS (Transiting Exoplanet Survey Satellite), just found its first Earth-sized world. Though the Earth-sized planet, and its hot sub-Neptune companion, were first observed by TESS in January 2019, it’s taken until now to confirm their status with ground-based follow-up observations. The discovery is published in The Astrophysical Journal Letters. When TESS …
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  2. #2
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    "TESS measures HD21749b to be 2.61 +0.17/−0.16 R⊕, and combined archival and follow-up precision radial velocity data put the mass of the planet at 22.7 +2.2/−1.9 M⊕."

    This is Earth-sized?

    "HD 21749b contributes to the TESS Level 1 Science Requirement of providing 50 transiting planets smaller than 4 R⊕ with measured masses."

    A loose definition of Earth-sized, but I get it now.
    There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.
    Mark Twain, Life on the Mississippi (1883)

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