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2019-03-05. The first planet Kepler spotted has finally been confirmed 10 years later.

posted Mar 9, 2019, 12:24 PM by Alan Gould
By Lisa Grossman, Science News. [https://www.sciencenews.org/article/first-planet-kepler-finally-confirmed-10-years-later] For A Changing Cosmos chapter 8. Excerpt: A decade after being found, the first exoplanet candidate spotted by the Kepler space telescope has been confirmed as a real world. The planet orbits a star initially dubbed KOI 4, for Kepler Object of Interest 4 (KOIs 1 through 3 were known before Kepler launched in March 2009). ...The Kepler team originally thought the star was about 1.1 times the width of the sun, which would make the planet about the size of Neptune. But then astronomers saw a second dip in starlight as the world passed behind the star, called a secondary eclipse. That second dip shouldn’t be visible for such a small planet, so the exoplanet candidate was dismissed as a false alarm. ...KOI 4 is actually about three times the width of the sun, meaning its planet would be about three times as large as first estimated — or a bit larger than Jupiter, the team found. That’s big enough for the world to block enough starlight that Kepler would notice that secondary eclipse, Chontos said March 5 in a presentation at NASA’s Kepler & K2 science conference in Glendale, Calif. After the findings were double checked by astronomers using ground-based telescopes, the star was renamed Kepler 1658, and the planet Kepler 1658b, adding the system to Kepler’s long list of discoveries. “It feels really cool to have that first planet there,” Chontos said....