HAT-P-67

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HAT-P-67 is a binary star system in the Hercules constellation, about 1,200 light-years away. The brighter star, HAT-P-67A, is an F-type subgiant with about 1.7 solar masses, 2.65 solar radii, and almost 12 times the Sun’s luminosity, with a surface temperature around 6,640 K. It spins rapidly, completing a rotation roughly every 5.4 days. The companion, HAT-P-67B, is a red dwarf about half the Sun’s mass, with a radius of about 0.68 solar radii and a temperature near 3,600 K. The two stars are physically bound, separated by about 9 arcseconds on the sky (a projected distance of roughly 3,400 astronomical units), and Gaia measurements show they share similar distance and motion.

There is one known planet, HAT-P-67b, which orbits the primary every 4.8 days at about 0.065 AU. HAT-P-67b is a gas giant noted for its unusually large size and very low density compared with other planets of its kind.