![]() ![]() From these readings, the parent star's radial velocity relative to the Earth is varying with an amplitude of about 1.4 metres (4.5 feet) per second. It was found using the radial velocity method, where periodic Doppler shifts of the parent star's spectral lines suggest an orbiting object. The planet's discovery was announced in August 2016. It is subject to stellar wind pressures of more than 2,000 times those of Earth from the solar wind, and its habitability has not yet been definitively established. Proxima Centauri b orbits the star at a distance of roughly 0.05 AU (7,500,000 km 4,600,000 mi) with an orbital period of approximately 11.2 Earth days, and has an estimated mass of at least 1.2 times that of Earth. It is approximately 1.28 parsecs or 4.2 light-years (4.0 ×10 13 km) from Earth in the constellation Centaurus, making it and Proxima c the closest known exoplanets to the Solar System. ![]() Proxima Centauri b (also called Proxima b or Alpha Centauri Cb) is an exoplanet orbiting in the habitable zone of the red dwarf star Proxima Centauri, which is the closest star to the Sun and part of a triple star system. ![]()
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