Crescent Nebula, NGC6888 (Anders Gengård)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

Crescent Nebula, NGC6888, Anders Gengård

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Crescent Nebula, NGC6888

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Crescent Nebula, NGC6888

Ännu en i raden av nebulosor som den tyskfödde astronomen William Herschel upptäckte i slutet av 1700-talet. I hans teleskop såg nebulosan ut som en halvmåne och fick därför namnet Crescent Nebula. I dagens teleskop ser man betydligt mer och den påminner väl mest om en hjärna.

Stjärnan i mitten är en så kallad röd jätte och det är den som är upphovet till nebulosan. Efter ett kort men intensivt liv börjar vätet i stjärnan ta slut och den har börjat pulsera. Materia slungas ut i rymden och detta glöder i den ultravioletta strålningen från den heta stjärnan.

Stjärnan är ungefär fem gånger så stor som vår sol och 20 gånger så tung. Den lyser 600.000 gånger starkare än solen och nu efter ynka 4.7 miljoner år närmar den sig därför slutet på sitt korta men intensiva liv. Om några hundra tusen år kommer den förmodligen explodera i en supernova.
Som jämförelse kan nämnas att vår sol är 4.6 miljarder år gammal och kommer sluta sina dagar betydligt lugnare.

Den ljussvaga nebulosan ligger i stjärnbilden Svanen ungefär 5000 ljusår från oss. Den är 26 ljusår i diameter. På himlen är den något mindre än en fullmåne.

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Status	Basic success
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Astrometry.net job	3823654
PixInsight job	n/a
PixInsight queue size	n/a
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Crescent Nebula, NGC6888

Crescent Nebula, NGC6888

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Crescent Nebula, NGC6888

Crescent Nebula, NGC6888

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