M1 - Crab Nebula (Anders Gengård)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: Crab nebula · M 1 · NGC 1952

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M1 - Crab Nebula

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

Powered byPixInsight

M1 - Crab Nebula

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

Crab Nebula

För 965 år sedan, närmare bestämt den 4/7 1054, noterade kinesiska astronomer en ny stjärna i Oxens stjärnbild, som i nästan en månad syntes även dagtid. Under de följande två åren bleknade den successivt för att slutligen försvinna.
Vi vet idag att det var en supernova de såg, en av de mest explosiva företeelserna i universum.

En supernova uppstår när en mycket tung stjärna förbrukat sitt bränsle och dess kärna kollapsar. De yttre lagren av materia kastas då ut i rymden i en enorm chockvåg och det är chockvågen efter supernovan år 1054 man ser på min bild.

Det som idag är kvar av den då kollapsade stjärnan i nebulosans mitt är ett klot av neutroner, ungefär 20km i diameter med en massa större än vår sol som snurrar med 30 varv per sekund - en neutronstjärna.

Själva namnet Crab Nebula eller ”Krabbnebulosan” fick molnet av den irländske astronomen William Parsons 1844, efter att han ritat av nebulosan och konstaterade att teckningen mest såg ut som en krabba. Fyra år senare, med ett dubbelt så stort teleskop, noterade han att det inte alls påminde så mycket om en krabba men namnet hade då redan rotat sig.

Nebulosan ligger 6.500 ljusår från oss och är idag ungefär 11 ljusår i diameter. Den expanderar med 1.500 km/s och man kan tydligt se detta om man jämför foton tagna för drygt hundra år sedan med foton tagna idag.

Krabbnebulosan är det första objektet i Charles Messiers katalog och är därför även känd som M1.

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Astrometry.net job	3264159
PixInsight job	n/a
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