New shot of Proxima Centauri, our nearest neighbour
Proxima Centauri lies in the constellation of Centaurus (The Centaur), just over four light-years from Earth. Although it looks bright through the eye of Hubble, as you might expect from the nearest star to the Solar System, Proxima Centauri is not visible to the naked eye. Its average luminosity is very low, and it is quite small compared to other stars, at only about an eighth of the mass of the Sun.
However, on occasion, its brightness increases. Proxima is what is known as a “flare star”, meaning that convection processes within the star’s body make it prone to random and dramatic changes in brightness. The convection processes not only trigger brilliant bursts of starlight but, combined with other factors, mean that Proxima Centauri is in for a very long life. Astronomers predict that this star will remain middle-aged — or a “main sequence” star in astronomical terms — for another four trillion years, some 300 times the age of the current Universe.
These observations were taken using Hubble’s Wide Field and Planetary Camera 2 (WFPC2). Proxima Centauri is actually part of a triple star system — its two companions, Alpha Centauri A and B, lie out of frame.
Although by cosmic standards it is a close neighbour, Proxima Centauri remains a point-like object even using Hubble’s eagle-eyed vision, hinting at the vast scale of the Universe around us.
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Proxima CentauriProxima Centauri (též alfa Centauri C a V 645 Centauri) je hvězda nacházející se ve vzdálenosti 4,22 světelných let (tj. přibližně 1,3 parseku nebo 3,99×1013 kilometrů) od Země. Je tak nejbližší hvězdou sluneční soustavy. Jedná se o červeného trpaslíka spektrální třídy M v souhvězdí Kentaura, v úhlové vzdálenosti přibližně 2° od nejjasnější hvězdy souhvězdí, alfy Centauri. Po astrofyzikální stránce jde o nepravidelnou eruptivní proměnnou hvězdu typu UV Ceti. Vzhledem ke své poloze na jižní pozemské obloze není Proxima severně od 27. rovnoběžky pozorovatelná, tedy ani v nejjižnější části Evropy nevychází nad obzor. .. pokračovat ve čtení