Alpha Centauri | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-22

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Alpha_Centauri


00:02:29 1 Nomenclature
00:04:26 2 Stellar system
00:05:20 2.1 Orbital properties
00:08:39 2.2 Physical properties
00:10:25 2.2.1 Alpha Centauri A
00:11:50 2.2.2 Alpha Centauri B
00:12:57 2.2.3 Alpha Centauri C
00:13:29 3 Observation
00:16:23 4 Observational history
00:20:26 5 Kinematics
00:22:59 5.1 Predicted future changes
00:25:36 6 Planetary system
00:25:46 6.1 Confirmed planets
00:26:27 6.2 Controversial and hypothetical planets
00:26:38 6.2.1 Alpha Centauri Bb
00:27:05 6.2.2 Unconfirmed discovery
00:28:07 6.2.3 Hypothetical planets
00:30:15 6.3 Circumstellar discs
00:33:31 7 View from this system
00:33:42 8 Other names
00:34:39 9 Future exploration
00:34:49 10 Distance estimates
00:36:24 11 See also
00:38:28 12 Notes
00:39:54 13 References
00:40:04 14 External links



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SUMMARY
=======
Alpha Centauri (Latinized from α Centauri, abbreviated Alpha Cen or α Cen) is the closest star system and closest planetary system to the Solar System at 4.37 light-years (1.34 pc) from the Sun. It is a triple star system, consisting of three stars: α Centauri A (officially Rigil Kentaurus), α Centauri B (officially Toliman), and α Centauri C (officially Proxima Centauri).Alpha Centauri A and B are Sun-like stars (Class G and K), and together they form the binary star Alpha Centauri AB. To the naked eye, the two main components appear to be a single star with an apparent magnitude of −0.27, forming the brightest star in the southern constellation of Centaurus and the third-brightest in the night sky, outshone only by Sirius and Canopus.
Alpha Centauri A has 1.1 times the mass and 1.519 times the luminosity of the Sun, while Alpha Centauri B is smaller and cooler, at 0.907 times the Sun's mass and 0.445 times its luminosity. The pair orbit about a common centre with an orbital period of 79.91 years. Their elliptical orbit is eccentric, so that the distance between A and B varies from 35.6 astronomical units (AU), or about the distance between Pluto and the Sun, to that between Saturn and the Sun (11.2 AU).
Alpha Centauri C, or Proxima Centauri, is a small and faint red dwarf (Class M). Though not visible to the naked eye, Proxima Centauri is the closest star to the Sun at a distance of 4.24 light-years (1.30 pc), slightly closer than Alpha Centauri AB. Currently, the distance between Proxima Centauri and Alpha Centauri AB is about 13,000 astronomical units (0.21 ly), equivalent to about 430 times the radius of Neptune's orbit. Proxima Centauri b is an Earth-sized exoplanet in the habitable zone of Proxima Centauri; it was discovered in 2016.