[4] Because of its appearance, it is also called the Cygnus Loop. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, an area around Cygnus. Ils sont souvent cités comme indicateurs d'une étoile variable lumineuse bleue, bien qu'ils se produisent aussi dans d'autres types d'étoiles[13],[16]. Astropedia es una comunidad FANDOM en Estilo de vida. Sus aumentos de brillo se deben a que la estrella expulsa capas de gas. More than 16 members appear in an amateur telescope. L'any 1600, P Cygni va aparèixer com un astre de tercera magnitud en un lloc on no s'havia observat anteriorment cap estel. [4], There are several asterisms in Cygnus. The two objects in the system are incredibly close together, with an orbital period of less than 0.28 days. There is an orange star of magnitude 10 nearby and a star of magnitude 9 near the nebula's northwest edge. It was first discovered visually near San Jose, California and publicly reported by amateur astronomer Stephen Waldee in 2007, and was confirmed photographically by Al Howard in 2010. Moi afastada de nós, non se coñece a súa distancia con exactitude, podendo estar entre 1600 e 3200 anos luz.O seu brillo ten que ser extraordinario, cunha luminosidade entre 60.000 e 250.000 soles. Its traditional name means "breast" and refers to its position in the constellation. [9], Cygnus culminates at midnight on 29 June, and is most visible in the evening from the early summer to mid-autumn in the Northern Hemisphere. [4], The Gamma Cygni Nebula (IC 1318) includes both bright and dark nebulae in an area of over 4 degrees. Berkeley 90 is a smaller open cluster, with a diameter of 5 arcminutes. The three-letter abbreviation for the constellation, as adopted by the IAU in 1922, is "Cyg". Lleva tu comunidad favorita contigo y no te pierdas de nada. Deneb, the brightest in the constellation is at its tail, and Albireo as the tip of its beak. Après avoir brillé pendant seulement quelques millions d'années (à comparer à plusieurs milliards d'années pour le Soleil) elles explosent en supernova. Elle brilla de nouveau en 1655, mais s'était de nouveau affaiblie en 1662. The other stars, approximately 3700 light-years from Earth, are mostly blue-white and very hot. P Cygni (34 Cygni) es una estrella de la constelación Cygnus, una de las más lejanas que se pueden ver a simple vista, pues se halla a una incierta distancia entre 5000 y 7000 años luz del sistema solar[1]. In Polynesia, Cygnus was often recognized as a separate constellation. The primary is a blue-white hued giant star of magnitude 2.9, and the secondary is a star of magnitude 6.6. [4], Plantilla:Listaref Elle a très peu varié en luminosité et en spectre depuis une série de fortes explosions au 17ème siècle, tandis que le comportement typique des LBV consiste en une variation lente sur une période allant d'années à des décennies avec des explosions occasionnelles pendant lesquelles l'étoile montre une baisse significative de température et un accroissement de luminosité visuelle à luminosité à peu près constante. With a spectral type of G6V, the star is somewhat cooler than the Sun. It is a white supergiant star of spectral type A2Iae that varies between magnitudes 1.21 and 1.29,[12] one of the largest and most luminous A-class stars known. Both components are orange-hued dwarf (main sequence) stars; the primary is of magnitude 5.2 and the secondary is of magnitude 6.1. [4], To the south of Epsilon Cygni is the Veil Nebula (NGC 6960, 6962, 6979, 6992, and 6995), a 5,000-year-old supernova remnant covering approximately 3 degrees of the sky -[53] it is over 50 light-years long. P Cygni donne son nom à un type de particularité spectrocopique appelé profil P Cygni, où la présence simultanée d'absorption et d'émission dans le profil de la même raie spectrale indique l'existence d'une enveloppe gazeuse en expansion rapide à partir de l'étoile. Alongside Cygnus, noted above, he mentions a boy from Tempe who commits suicide when Phyllius refuses to give him a tamed bull that he demands, but is transformed into a swan and flies away. This is believed to be a highly auspicious time to meditate, do any task, or start the day. [48][49] The Kepler-22 system is also notable, in that its extrasolar planet is believed to be the first "Earth-twin" planet ever discovered. Elle fut découverte en 1600 par Willem Blaeu alors qu'elle entrait en activité. WR 102ka; LBV 1806-20; References P Cygni a été appelée « nova permanente » à cause de similitudes spectrales et des éjections évidentes de matière, et fut un temps traitée avec les novas comme une variable éruptive ; cependant son comportement n'est plus attribué au même processus que celui des vraies novas[12]. [9], Normally, Cygnus is depicted with Delta and Epsilon Cygni as its wings. This was the first x-ray source widely believed to be a black hole. Durante los próximos años la estrella atenuó su brillo y dejó de ser visible a simple vista, pero volvió a magnitud +3,5 en 1655. SS Cygni is a dwarf nova which undergoes outbursts every 7–8 weeks. It is one of largest stars currently known in the galaxy with a radius exceeding 1,000 solar radii.
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