HAT-P-1 b: A Jupiter-Like Planet Orbiting a Sun-Like Star

HAT-P-1 is a star located 519 light-years away with a spectral type of G0 V. It hosts one known planet. The star is estimated to be 3.6 billion years old, with a mass of 1.12 solar masses and a radius of 1.15 solar radii. Its temperature is 5980 K. The star's reported mass and radius estimates are larger than the Sun's, and its reported temperature is hotter than the Sun's.

The planet HAT-P-1 b is classified as Jupiter-like, meaning its radius exceeds four times Earth's radius. It was discovered in 2006 via the transit method, in which a planet passes in front of its star from our viewpoint, causing a small dip in observed brightness. HAT-P-1 b has a mass of 167 Earth masses and a radius of 14.8 Earth radii. Its mean density is 0.284 g/cm³, which is 0.0516 times Earth's. The planet completes an orbit every 4.47 days. Its reported radius and mass estimates are both larger than Earth's.