Proxima B
Planet Proxima B orbits the star Proxima Centauri, the closest star to the sun and is about 1.3 times the mass of Earth and is 4.22 light-years away.
Proxima b, appears to be rocky and might be warm enough to host liquid water, and thus be habitable.
Its orbit around Proxima Centauri (its year) is 11.2 earth days.
It is possible that the "Breakthrough Starshot" nanocraft project could survey the Centauri system around 2055-2060 timeframe.
Proxima Centauri also has a dust ring that lies far beyond Proxima b's orbit similar to our solar system's Kuiper Belt, , this may well be an indication of the existence of other planets in addition to Proxima b.
Standing on Proxima b - Closest Exoplanet to the Earth
As of April 2019 there is also potentially a second planet Proxima C orbiting the star Proxima Centauri
The Alpha Centauri star system is 25 trillion miles (4.37 light years) away. With today’s fastest spacecraft, it would take about 30,000 years to get there. Breakthrough Starshot aims to establish whether a gram-scale nanocraft, on a sail pushed by a light beam, can fly over a thousand times faster. It brings the Silicon Valley approach to space travel, capitalizing on exponential advances in certain areas of technology since the beginning of the 21st century.