Pertence à classe espectral K do sistema de classificação estelar proposto por Annie Jump Cannon. [35], In 1993, radial velocity measurements of Aldebaran, Arcturus and Pollux showed that Arcturus exhibited a long-period radial velocity oscillation, which could be interpreted as a substellar companion. It is now so entered in the IAU Catalog of Star Names. The star was chosen as it was thought that light from Arcturus had started its journey at about the time of the previous Chicago World's Fair in 1893 (at 36.7 light-years away, the light actually started in 1896).[66]. Knowing they had arrived at the exact latitude of the island chain, they sailed due west on the trade winds to landfall. É a quarta estrela mais brilhante no céu nocturno.[7]. The lower output in visible light is due to a lower efficacy as the star has a lower surface temperature than the Sun. Antigamente era classificada como uma gigante vermelha, mas na reclassificação proposta pela NASA é considerada atualmente como uma média alaranjada. [31], Arcturus is estimated to be around 6 billion to 8.5 billion years old,[7] but there is some uncertainty about its evolutionary status. It is the brightest star in Boötes and the 4th brightest star in the sky. With an apparent magnitude of -0.05, it is the brightest star in the northern celestial hemisphere, just outshining Vega and Capella. Beatport is the world's largest electronic music store for DJs. Arcturus é uma supergigante estrela vermelha na constelação Bootes(O Pastor), e a estrela mais brilhante daquela constelação, distando 36 anos-luz da Terra. Zeus averted their imminent tragic fate by transforming the boy into the constellation Boötes, called Arctophylax "bear guardian" by the Greeks, and his mother into Ursa Major (Greek: Arctos "the bear"). [59], One of the possible etymologies offered for the name "Arthur" assumes that it is derived from "Arcturus" and that the early Medieval character on whom the myth of King Arthur is based was originally named for the star. [55], In Ancient Rome, the star's celestial activity was supposed to portend tempestuous weather, and a personification of the star acts as narrator of the prologue to Plautus' comedy Rudens (circa 211 BC).[56][57]. Traveling east and north they eventually crossed the equator and reached the latitude at which Arcturus would appear directly overhead in the summer night sky. (1998) placed it slightly above the horizontal branch, and suggested it has already completed the helium flash stage. This constellation marked the path for Hawaiiloa on his return to Hawaii from the South Pacific Ocean. This substellar object would be nearly 12 times the mass of Jupiter and be located roughly at the same orbital distance from Arcturus as the Earth is from the Sun, at 1.1 astronomical units. The magnetic activity appears to lie along four latitudes and is rotationally-modulated. The Māori and Moriori called it Tautoru, a variant of the Marquesan name and a name shared with Orion's Belt.[54]. They suggested that the most plausible explanation for the variability of Arcturus is stellar oscillations. 131–136. α Boötis (Latinised to Alpha Boötis) is the star's Bayer designation. Agustin Sasson, Felipe Gonzalez AR Remix, Oliver Harper, [20], In 1984, the 90 cm (36-inch) reflecting Yapp telescope at Herstmonceux was tested with an echelle spectrograph from Queen's University Belfast and a CCD camera. In ancient Mesopotamia, it was linked to the god Enlil, and also known as Shudun, "yoke",[12] or SHU-PA of unknown derivation in the Three Stars Each Babylonian star catalogues and later MUL.APIN around 1100 BC. Arcturus is moving rapidly (122 km/s) relative to the Sun, and is now almost at its closest point to the Sun. Gerardo Moro, A New Life Arcturus, designation α Boötis (Latinized to Alpha Boötis, abbreviated Alpha Boo, α Boo), is the brightest star in the constellation of Boötes, the fourth-brightest in the night sky, and the brightest in the northern celestial hemisphere. Icário deu o vinho a uns pastores que, acreditando que Icário os tinha envenenado, mataram-no a pauladas. [38][39][40] or حارس الشمال ħāris al-shamāl’ "the keeper of north". [32], As one of the brightest stars in the sky, Arcturus has been the subject of a number of studies in the emerging field of asteroseismology. The Wotjobaluk Koori people of southeastern Australia knew Arcturus as Marpean-kurrk, mother of Djuit (Antares) and another star in Boötes, Weet-kurrk[43] (Muphrid). Liber Pater então afligiu as mulheres atenienses com uma praga, que só terminou quando eles puniram os pastores e instituiram um festival em honra dos dois. [47], Arcturus had several names that described its significance to indigenous Polynesians. [43] The people of Milingimbi Island in Arnhem Land saw Arcturus and Muphrid as man and woman, and took the appearance of Arcturus at sunrise as a sign to go and harvest rakia or spikerush. 2JOHN'S, Another Arabic name is Haris-el-sema, from حارس السماء ħāris al-samā’ "the keeper of heaven". Eugene Jay, Stasik T, When viewed from Earth, it appears to be positioned almost at the north galactic pole of the Milky Way. [45]:24,69,112 The Wailwun of northern New South Wales knew Arcturus as Guembila "red". Está cerca de 33 anos-luz do sistema solar e é uma das estrelas mais brilhantes no céu terrestre. É a quarta estrela mais brilhante no céu nocturno. As the brightest K-type giant in the sky, it was the subject of an atlas of its visible spectrum, made from photographic spectra taken with the coudé spectrograph of the Mt. [12]) Arcturus is thought to be an old-disk star, and appears to be moving with a group of 52 other such stars, known as the Arcturus stream.[25]. The parallax margin of error is 0.54 milliarcseconds, translating to a distance margin of error of ±0.23 light-years (0.069 parsecs). [45]:84, In Inuit astronomy, Arcturus is called the Old Man (Uttuqalualuk in Inuit languages) and The First Ones (Sivulliik in Inuit languages). [1] Because of its proximity, Arcturus has a high proper motion, two arcseconds a year, greater than any first magnitude star other than α Centauri. Coordenadas: 14h 15m 39.7s, +19° 10′ 56″, Arcturo (α Boo, α Boötis, Alpha Boötis), também conhecida como Arturo ou Arcturus,[6] é a estrela mais brilhante da constelação do Boieiro. [11] It has been known by this name since at least the time of Hesiod. Na mitologia romana, conforme relatado por Higino, Arcturus é o ateniense Icário. Since 1976, the Polynesian Voyaging Society's Hōkūleʻa has crossed the Pacific Ocean many times under navigators who have incorporated this wayfinding technique in their non-instrument navigation. [8], !CS1 manut: Nomes múltiplos: lista de autores (, https://pt.wikipedia.org/w/index.php?title=Arcturo&oldid=56173762, !CS1 manut: Nomes múltiplos: lista de autores, !Artigos que carecem de notas de rodapé desde julho de 2011, !Artigos que carecem de notas de rodapé sem indicação de tema, Atribuição-CompartilhaIgual 3.0 Não Adaptada (CC BY-SA 3.0) da Creative Commons.
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