Alpha Centauri

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Alpha Centauri

(ăl`fə sĕntôr`ē), brightest star in the constellation CentaurusCentaurus
, southern constellation located N and E of Crux, the Southern Cross. It is known especially for its bright stars Alpha Centauri and Hadar. It also contains Centaurus A, a radio galaxy, as well as a globular star cluster visible to the naked eye.
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 and 3d-brightest star in the sky; also known as Rigil Kent or Rigil Kentaurus; 1992 position R.A. 14h39.1m, Dec. −60°49'. Its apparent magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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 is −0.26. Alpha Centauri is actually a triple-star system, the components being designated A, B, and C. Alpha Centauri A is the brightest component; it is a yellow main-sequence star of the same spectral classspectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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 (G2 V) as the sun and of about the same size and mass. It forms a binary system with the somewhat smaller, less bright, and more orange Alpha Centauri B. Alpha Centauri C, a red dwarf, is also called Proxima Centauri because it is the closest star to the earth (other than the sun), at a distance of 4.28 light-years; components A and B are currently 4.34 light-years away. Proxima Centauri orbits about the common center of mass of the system with a period of more than 250,000 years, so that in about 125,000 years it will be more distant than A and B. In 2012 the discovery of a roughly earth-sized planet orbiting Alpha Centauri B was announced; the planet was reported to orbit the star closer than Mercury orbits the sun. A roughly earth-sized planet has also been identified (2016) orbiting Proxima Centauri. Though it orbits its star much more closely than the Mercury does the sun, it is believed to be in the habitable zone because of the cooler temperatures of Proxima Centauri; however, the star is of a type that tends to produce solar flares readily, which would bombard the nearby planet with high levels of radiation and strip any atmosphere from it.

Alpha Centauri

(sen-tor -ÿ, -ee) (Rigil Kentaurus; α Cen) A binary star that is the brightest star in the constellation Centaurus, one of the brightest in the sky, and the second nearest star to the Sun. The two components, A and B, form a yellow-orange visual binary (separation 17″.7, period 80.1 years) and are similar in mass and size to the Sun. Proxima Centauri appears to be physically associated with α Cen; it is the nearest star to the Sun. mv : –0.01 (A), 1.33 (B), –0.27 (AB); Mv : 4.4 (A), 5.7 (B), 4.1 (AB); spectral type: G2 V (A), K1 V (B); mass: 1.09 (A), 0.89 (B) times solar mass; distance: 1.33 pc.

Alpha Centauri

[¦al·fə sen′tȯ·rē]
(astronomy)
A double star, the brightest in the constellation Centaurus; apart from the sun, it is the nearest bright star to earth, about 4.3 light-years away; spectral classification G2. Also known as Rigil Kent.

Alpha Centauri

brightest star in Centaurus constellation; closest star to Earth. [Astronomy: NCE, 74]
References in periodicals archive ?
Noel Cruz Concepcion, ambos del Municipio de Amealco, del Municipio de Toliman y de la Comunidad Universitaria de los Estados de Queretaro y de San Luis Potosi.
Caracterizacion del agroecosistema tradicional y diversidad in situ de agaves mezcaleros en Monte Grande, Toliman, Jalisco.
Esos hablantes del nahuatl arcaico--y de gran prestigio--deben haber dado nombre a los lugares en el altiplano central, como Acolman, Tecama, Tolman, Ticuman y, mas al sur, al cerro de Tetlaman, al lugar homonimo, cercano a la Villa de Guadalupe (Tetlaman), asi como a los Tuliman o Toliman en el sur de Jalisco y numerosos, sobre todo, en las inmediaciones de Teotihuacan.
cultured Bat species Conguaco Oratorio San Lucas Toliman Artibeus jamaicensis 0/3 0/2 0 Artibeus lituratus 0/1 0/1 0/1 Artibeus toltecus 1/1 0 0 Carollia castanea 0 0 0 Carollia perspicillata 0 0/2 0/3 Desmodus rotundus 5/7 2/4 0/1 Glossophaga soricina 1/1 0/3 1/5 Micronycteris microtis 0 0 0 Myotis elegans 0 0 0 Myotis nigricans 00 0 Phyllostomus discolor 7/8 0 1/1 Platyrrhinus helleri 0 0 0 Pteronotus davyi 0 0 0 Sturnira lilium 1/3 0/5 0/2 Sturnira ludovici 0/1 0 0/1 Total 15/25 2/17 2/14 No.
(18) El caso es relevante puesto que se obtuvo directamente de sus propietarios, una familia otomi de Toliman que la guardaba celosamente a manera de reliquia; la vendieron por considerar que en un museo se conservaria mejor, pero no proporcionaron mas datos.
Three volcanoes rise from the lake-Atitlan, Toliman, and San Pedro--eternal watchmen of the waters and of the people who have made their living on its banks.
La impresion es que mientras la ciudad era realista sus cercanias eran insurgentes, a quienes ubica en el Corregimiento son precisamente a los indigenas, principalmente de Toliman, San Pablo y de San Miguelito, y en menor medida a los de Tequisquiapan, Peftamiller, Cade-reyta y Sierra Gorda, que, nos dice, bajo las ordenes de Rayon y Villagran se insurreccionaron desde el mes de octubre de 1810 (29).
Varios grupos de otomies, probables descendientes de los que en diversos lugares vivieron al lado de otros pueblos principalmente nahuas, habitan actualmente en regiones como la de Toliman y Amealco en Queretaro y en otros varios lugares de los estados del centro del pais.
Cecilia Odet Gutierrez, 12, is a sixth-grader from San Lucas Toliman, a town of 13,000 people that borders Lake Atitlan.
El Estado de Queretaro cuenta con una poblacion indigena originaria de 63, 246 habitantes (5), principalmente de las etnias nanhu (otomi), que representan el 86% de los hablantes de alguna lengua indigena en el estado, teenek (huasteco) y xi'ui (pame), ubicada en su mayor parte en los municipios de Amealco de Bonfil, Toliman, Cadereyta de Montes, Ezequiel Montes, Colon y Jalpan de Serra.
In San Salvador, 580 people attended the show at a theater, and the performance in Guatemala at the lakeside village of San Lucas Toliman drew a crowd of 1,000.