In the equatorial coordinate system, the right ascension coordinates of these borders lie between 19h 07.3m and 22h 02.3m , while the declination coordinates are between 27.73° and 61.36°. Illuminated by a hot embedded star of magnitude 6, NGC 7000 is 1500 light-years from Earth. [44] One of the most notable systems is the Kepler-11 system, containing six transiting planets, all within a plane of approximately one degree. The prominent star in the north of the cluster has a golden color, whereas the stars in the south of the cluster appear orange. [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. Les variables lumineuses bleues comme P Cygni sont très rares et à vie courte, et se forment seulement dans les régions des galaxies où une intense formation d'étoiles a lieu. [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. It is an orange-hued giant star of magnitude 2.5, 72 light-years from Earth.[19][20].

Elle a été identifiée comme possible candidate supernova de type IIb dans la modélisation du destin des étoiles ayant 20 à 25 fois la masse du Soleil (avec le statut de LBV comme stade final prévu auparavant)[15]. It, too, has nebulosity in the east. The system's total magnitude varies from 12th magnitude at its dimmest to 8th magnitude at its brightest. [4], There are several asterisms in Cygnus. Deneb was also often a given name, in the Islamic world of astronomy. The two components are visible in a medium-sized amateur telescope. Dolidze 11 is an open cluster 400 million years old, farthest away of the three at 3700 light-years. También se la conoce como Nova Cygni 1600.

P Cygni is a blue supergiant star located in the constellation Cygnus.It is 76 times larger than the Sun and 30 times more massive. It has low surface brightness because it is so large; at its widest, the North America Nebula is 2 degrees across. 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. Etäisyyden tarkka määritys on vaikeaa, koska tähden parallaksia ei tunneta. De son côté, P Cygni montre seulement des variations de luminosité et des variations spectrales relativement faibles, mais a subi au moins deux des éruptions géantes subies seulement par Eta Carinae et peut-être une poignée d'objets extra-galactiques[13]. La estrella sigue perdiendo masa a un ritmo extraordinario, 300 millones de veces mayor que la pérdida de masa del Sol por el viento solar. Dans les derniers siècles, elle a très lentement accru sa magnitude visuelle et décru en température, ce qui a été interprété comme la tendance évolutive attendue pour une étoile massive vers un stade de supergéante rouge[13]. P Cygni est largement considérée comme étant le plus ancien exemple connu de variable lumineuse bleue. The primary is a blue-white hued giant star of magnitude 2.9, and the secondary is a star of magnitude 6.6. The binary system has a period of 790 years and is 73 light-years from Earth. [4] When an observer focuses on the star, the nebula appears to fade away. The brightest of these are two gold-hued stars, which represent the bottom of the toy it is named for. Since 1715, the star has been of 5th magnitude, despite being more than 5000 light-years from Earth. [14] Its traditional name means "tail" and refers to its position in the constellation. 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. Vu 1655 bis 1662 war en dann nees ze gesinn. The nebulosity in this region is part of the Gamma Cygni Nebula. It is of spectral type A5IIIn and magnitude 4.83, and is around 610 light-years from Earth. ḏanab, tail) – which is one of the brightest stars in the night sky and is the most distant first-magnitude star as its "tail star" and one corner of the Summer Triangle. Most of the east has part of the Hercules–Corona Borealis Great Wall in the deep sky, a giant galaxy filament that is the largest known structure in the observable universe, covering most of the northern sky.

In the 17th-century German celestial cartographer Johann Bayer's star atlas the Uranometria, Alpha, Beta and Gamma Cygni form the pole of a cross, while Delta and Epsilon form the cross beam. There are several other dimmer double and binary stars in Cygnus. The open cluster Berkeley 90 is embedded in this large nebula, which measures 30 by 20 arcminutes.[51]. [53] The Loop is only visible in long-exposure astrophotographs. [39] W Cygni is a semi-regular variable red giant star, 618 light-years from Earth.It has a maximum magnitude of 5.10 and a minimum magnitude 6.83; its period of 131 days. 61 Cygni is significant because Friedrich Wilhelm Bessel determined its parallax in 1838, the first star to have a known parallax. In Polynesia, Cygnus was often recognized as a separate constellation. Astropedia es una comunidad FANDOM en Estilo de vida. Though the tertiary component is visible in binoculars, the primary and secondary currently require a medium-sized amateur telescope to split, as they will through the year 2020. La luminosité visuelle s'accroît d'environ 0,15 magnitude par siècle, phénomène attribué à une lente baisse de température à luminosité constante[11]. Ces profils sont utiles dans l'étude des vents stellaires de beaucoup de types d'étoiles.

L'atlas de Bayer de 1603 lui assigna le label particulier P et le nom a été conservé depuis. The internet Encyclopedia of Science (en inglés), https://astronomia.fandom.com/wiki/P_Cygni?oldid=2064. The two stars will be closest between 2043 and 2050, when they will require a telescope with larger aperture to split. 3100 light-years from Earth, more than 30 stars are visible in a diameter of 8 arcseconds. Berkeley 90 is a smaller open cluster, with a diameter of 5 arcminutes. Cygnus is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. P Cygni on muuttuva tähti, jonka kirkkaudessa on tapahtunut muutoksia vuosien kuluessa.Vuonna 2005 tähden kirkkaus oli noin 4,82 ja etäisyys Maasta 5 000 – 6 000 valovuotta. Zeus disguised himself as a swan to seduce Leda, Spartan king Tyndareus's wife, who gave birth to the Gemini, Helen of Troy, and Clytemnestra;[4] Orpheus was transformed into a swan after his murder, and was said to have been placed in the sky next to his lyre (Lyra); and the King Cygnus was transformed into a swan. La dernière modification de cette page a été faite le 19 octobre 2020 à 22:00. The jets' interaction with the interstellar medium creates radio lobes, one source of radio emissions.

The other stars, approximately 3700 light-years from Earth, are mostly blue-white and very hot. Cygnus X-3 is a microquasar containing a Wolf–Rayet star in orbit around a very compact object,[22] with a period of only 4.8 hours. P Cygni is a luminous blue variable that brightened suddenly to 3rd magnitude in 1600 AD. [4], Plantilla:Listaref fi:P Cygni [15] Gamma Cygni, traditionally named Sadr, is a yellow-tinged supergiant star of magnitude 2.2, 1500 light-years away.



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