KELT-1 is a F-type main-sequence star. Its surface temperature is 6518±50 K. It is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.008±0.073, but is much younger at an age of 1.75±0.25 billion years. The star is rotating very rapidly. A red dwarf stellar companion at a projected separation of 154±8 AU was detected in 2012, simultaneously with a planetary companion.
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