The HIP 67851 Exoplanetary System
HIP 67851 is a star with 1.63 times the mass of the Sun, and 5.92 times its radius. It is located 215.13 light years away from the solar system.
HIP 67851 is known to have 2 exoplanets in orbit around it.
HIP 67851 b
HIP 67851 b was discovered by the Multiple Observatories observatory using the radial velocity method. Its discovery was announced in 2015-01. Its semi-major axis is 0.46 astronomical units, as compared to Earth's which is 1 astronomical unit. It takes 88.90 Earth days to complete an orbit around its host star, HIP 67851.
Its eccentricity, the extent to which the shape of the exoplanet's orbit departs from a perfect circle (Earth's is 0.0167, which is why the shape of Earth's orbit is circular rather than oval in appearance), is 0.05, which means that when HIP 67851 b is at is at its closest point to its host star, 0.44 astronomical units separates the two, and when it is at its farthest point, this number is 0.48. In the case of Earth, these numbers are 0.9832899 and 1.0167103 respectively.
The mass of HIP 67851 b is 438.58 times the mass of Earth. At more than 50 Earth masses, HIP 67851 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn in our solar system.