HD 85512 b – a super-Earth exoplanet

HD 85512 b – a super-Earth exoplanet

HD 85512 b is a super-Earth exoplanet in the habitable zone of a K-type star. It is an exoplanet that orbits HD 85512, a K-type main-sequence star 36 light-years from Earth in the constellation Vela. It has a mass of 3.6 Earths, takes 58.4 days to complete one orbit around its star, and is 0.26 AU away from it. It was discovered in 2011 and was announced at the time.

HD 85512 b is categorized as a rocky Earth-size exoplanet ( 5M☉) and is one of the smallest exoplanets identified to be barely outside the inner border of the habitable zone due to its mass of at least 3.6 times that of Earth. HD 85512 b, along with Gliese 581 d, was originally regarded as one of the most promising possibilities for habitability in 2011.

European scientists identified a planet 36 light-years distant that might be as hot as a steam bath and perhaps habitable. According to the researchers, the planet, known as HD 85512 b, has Goldilocks-like conditions, with neither too much nor too little liquid water on its surface — and thus life. They interpret it as a positive hint that there may be life outside our solar system.

Mass, radius and temperature

The planet has a minimum Earth mass of 3.6 0.5, a minimum surface gravity of roughly 1.4 g, and an estimated temperature of 298 K (24.85 °C or 76.73 °F) at the top of its atmosphere, despite its significantly higher mass. The estimated temperature is stated to be similar to temperatures in Southern France, although other atmospheric circumstances prevalent on the planet must be evaluated in order to assess the surface temperature. Based on its mass, an estimated radius of 1.3 REarth is plausible.

Host star

HD 85512 is a (K-type) star that the planet circles. The star has a radius of about 0.53 R☉ and a mass of 0.69 M☉. It is 5.61 billion years old and has a surface temperature of 4715 K. The Sun, on the other hand, is approximately 4.6 billion years old and has a surface temperature of 5778 K.

The apparent magnitude of the star, or how brilliant it appears from Earth’s perspective, is 7.43. As a result, HD 85512 is too dim to see with the naked eye but can be seen with decent binoculars.


The planet orbits the parent star (which has about 11% the brightness of the Sun) at a distance of around 0.26 AU, with an orbital period of about 54 days, and may be tidally locked.

HD 85512 b is an exoplanet that orbits the star HD 85512, which is 36.9 light-years distant from our Solar System. Its discovery was made public in 2011. HD 85512 has an apparent magnitude of 7.7 and an absolute magnitude of 7.4. It is 0.7 times more massive and 0.6 times larger than our Sun. The surface temperature is 4715 degrees Fahrenheit, and the spectral type is K5V. The extrasolar planet HD 85512 b orbits the star HD 85512 every 58.4 days at an orbital distance of 0.26 light-years.