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V476 Cygni or Nova Cygni 1920 was a nova which occurred in the constellation Cygnus in 1920. It was discovered by William Frederick Denning, an English amateur astronomer, at 09:30 GMT on 20 August 1920, at which time it had a magnitude of 3.7. It reached a peak brightness of magnitude 1.7 on 23 August 1920. Its quiescent brightness is magnitude 17.09.

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  • V476 Cygni (de)
  • Nova Cygni 1920 (es)
  • V476 Cygni (fr)
  • V476 Cygni (en)
  • V476 Cygni (sv)
  • 天鹅座V476 (zh)
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  • V476 Cygni war eine Nova, die 1920 im Sternbild Schwan erschien und eine Helligkeit von 2,0 mag erreichte. Heute ist V476 Cygni 17,09 mag hell. (de)
  • V476 Cygni (ou Nova Cygni 1920) était une nova qui survint en 1920 dans la constellation du Cygne. Elle atteignit une magnitude minimale (correspondant à une luminosité maximale) de 2,0. Actuellement, V476 Cygni a une magnitude de 17,09. (fr)
  • V476 Cygni eller Nova Cygni 1920 var en nova i stjärnbilden Svanen. Novan upptäcktes den 24 augusti 1920 av den flitige brittiske amatörastronomen William Frederick Denning V 476 Cygni nådde magnitud +1,9 i maximum och avklingade sedan snabbt. Stjärnan är numera av magnitud 17,1. (sv)
  • V476 Cygni o Nova Cygni 1920 es una nova aparecida en la constelación de Cygnus en 1920.​ Fue vista por primera vez el 22 de agosto de ese año y alcanzó un brillo de magnitud aproximada de 1.9 la noche siguiente, para caer hasta 3.8 luego de 7 días, durante los cuales se la observaba a simple vista. En los primero dos meses de observaciones declinó cerca de 7 magnitudes, siendo esta declinación mayor que la de Nova Persei 1901, que se redujo 5.1 órdenes en igual periodo.​ (es)
  • V476 Cygni or Nova Cygni 1920 was a nova which occurred in the constellation Cygnus in 1920. It was discovered by William Frederick Denning, an English amateur astronomer, at 09:30 GMT on 20 August 1920, at which time it had a magnitude of 3.7. It reached a peak brightness of magnitude 1.7 on 23 August 1920. Its quiescent brightness is magnitude 17.09. (en)
  • 天鵝座V476或1920天鵝座新星是1920年現在天鵝座的一顆新星。它是由英國業餘天文學家威廉·弗雷德里克·丹寧於1920年8月20日09:30格林威治標準時間發現的,當時它的亮度為3.7等。它在1920年8月23日達到了1.7等的峰值亮度。它的靜態亮度為17.09等。 天鵝座V476的光變曲線非常不尋常,顯示出從最大亮度迅速下降,隨後緩慢的近乎線性的衰減。它被歸類為非常快的新星,但尾巴很長。光變曲線呈現出「塵埃蛻降」,快速下降到局部亮度最小值,然後亮度小幅增加,最後是漫長而緩慢的下降。據信,這種塵埃蛻降與從新星中噴射出來物質,因為它遠離恆星並冷卻形成塵埃的過程相吻合。 所有新星都由一對緊密的雙星組成,一顆白矮星和一顆"施主"恆星相互圍繞著旋轉。這兩顆恆星之間的距離如此貼近,以至於密度較低的供體恆星向白矮星轉移了物質。在天鵝座V476的情況下,建立的模型表明白矮星的質量為1.18,並且它每年從供體恆星接收6×10−10 M⊙物質。而且天鵝座V476比預期的要早得多,已經轉變為一顆復發的矮新星。 (zh)
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