Proxima Centauri | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Proxima_Centauri


00:03:10 1 Observation
00:07:15 2 Physical properties
00:14:23 2.1 Distance and motion
00:21:23 3 Planetary system
00:27:32 3.1 Habitability
00:30:07 4 Future exploration
00:32:28 5 See also



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SUMMARY
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Proxima Centauri is a small, low-mass star located 4.244 light-years (1.301 pc) away from the Sun in the southern constellation of Centaurus. Its Latin name means the "nearest [star] of Centaurus". This object was discovered in 1915 by Robert Innes and is the nearest-known star to the Sun. With a quiescent apparent magnitude of 11.13, it is too faint to be seen with the naked eye. Proxima Centauri forms a third member of the Alpha Centauri system, being identified as component Alpha Centauri C, and is 2.18° to the southwest of the Alpha Centauri AB pair. Currently it has a physical separation of about 12,950 AU (1.94 trillion km) from AB and an orbital period of 550,000 years.This is a red dwarf star with a mass about an eighth of the Sun's mass (M☉), and its average density is about 33 times that of the Sun. Because of Proxima Centauri's proximity to Earth, its angular diameter can be measured directly as about one-seventh the diameter of the Sun. Although it has a very low average luminosity, Proxima is a flare star that undergoes random dramatic increases in brightness because of magnetic activity. The star's magnetic field is created by convection throughout the stellar body, and the resulting flare activity generates a total X-ray emission similar to that produced by the Sun. The mixing of the fuel at Proxima Centauri's core through convection and its relatively low energy-production rate mean that it will be a main-sequence star for another four trillion years, or nearly 300 times the current age of the universe.In 2016, the European Southern Observatory announced the discovery of Proxima Centauri b, a planet orbiting the star at a distance of roughly 0.05 AU (7.5 million km) with an orbital period of approximately 11.2 Earth days. Its estimated mass is at least 1.3 times that of the Earth. The equilibrium temperature of Proxima b is estimated to be within the range of where water could exist as liquid on its surface, thus placing it within the habitable zone of Proxima Centauri, although because Proxima Centauri is a red dwarf and a flare star, whether it could support life is disputed.
Previous searches for orbiting companions had ruled out the presence of brown dwarfs and supermassive planets.