NGC7635 - Bubble Nebula (Anders Gengård)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble nebula · M 52 · NGC 7538 · NGC 7635 · NGC 7654

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NGC7635 - Bubble Nebula

Link: https://flic.kr/s/aHsmpbZkJ5

Powered byPixInsight

NGC7635 - Bubble Nebula

Link: https://flic.kr/s/aHsmpbZkJ5

Föga förvånande har objektet i mitten av bilden fått namnet Bubbelnebulosan. Den upptäcktes 1787 av den tyske astronomen William Herschel. Avståndet från oss är ungefär 8.000 ljusår.
Själva bubblan består av solvinden från en ca 4 miljoner år gammal stjärna med 45 ggr vår sols massa och det gul-röda molekylmolnet runt bubblan lyser upp på grund av att elektroner exiteras av strålningen från den unga heta stjärnan.

Tretton år innan Herschels upptäckt, i september 1774, noterade hans franske kollega Charles Messier stjärnhopen som syns till vänster ovanför bubblan. Han listade den som M52 i sin katalog över diffusa objekt. Avståndet från oss till hopen är lite knappt 5.000 ljusår och den består av ungefär 200 stjärnor inom ett område på 20 ljusår. Stjärnhopen har en samlad massa på motsvarande 1200 ggr vår egen sol.

Till höger ovanför bubblan ligger en annan nebulosa. Den har listnamnet NGC7538 och inne i molekylmolnet pågår en intensiv aktivitet inom ett område på ca 1 ljusår. Mängder av nya stjärnor håller på att bildas och bland annat har man där upptäckt den hittills största kända ”protostjärnan”, en mycket ung stjärna som fortfarande växer tack vare inströmmande gasmolekyler. Den är redan ungefär 300 gånger så stor som hela vårt solsystem och är förmodligen inte fullvuxen än på ett tag. Vikten på den uppskattas öka med 1/1000 av vår sols massa varje år, vilket är ungefär 2.000.000.000.000.000.000.000.000 ton. Vårt avstånd till NGC7538 är 9.000 ljusår.

I nedre högra hörnet av bilden syns även de norra delarna av ”Lobster Claw Nebula”.

Hela området ligger en liten bit ovanför stjärnbilden Cassiopeia.

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