M45 - Pleiades (Anders Gengård)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: Maia nebula · Merope nebula · NGC 1432 · NGC 1435 · The star 18Tau · The star Atlas (27Tau) · The star Celaeno (16Tau) · The star Electra (17Tau) · The star Merope (23Tau) · The star Pleione (28Tau) · The star Sterope I (21Tau) · The star Taygeta (19Tau) · The star ηTau

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M45 - Pleiades

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

Powered byPixInsight

M45 - Pleiades

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

Plejaderna är en så kallad öppen stjärnhop i Oxens stjärnbild. Den kallas också för Sjustjärnorna.

Det är en av våra närmaste stjärnhopar, på ungefär 400 ljusårs avstånd och kan lätt ses utan kikare.

Anledningen till den närmast totala avsaknaden av andra färger än blått i nebulositeten är att detta är en reflektionsnebulosa. De unga, extremt heta och blålysande stjärnornas ljus reflekteras i det omgivande stoft som stjärnorna passerar genom.
Med en kikare kan man urskilja detta som ett grått töcken runt de starkast lysande stjärnorna.

I mars 1769 skrev astronomen Charles Messier in Plejaderna i sin katalog över ytterligt ljussvaga objekt som han inte ville riskera förväxla med kometer. Den fick nummer 45, M45.
Lite märkligt kan tyckas, eftersom stjärnhopen vid det laget hade varit både avbildad och namngiven i närmare 3500 år och att missta den för en komet är omöjligt.
Man tror idag, att han då helt enkelt behövde fler objekt i sin katalog för att dryga ut avståndet till sina konkurrenter.

Till höger om Electra, den ”högraste” av de större stjärnorna, kan man, om man zoomar in, urskilja en liten avlång galax.
Benämningen på den är UGC2838 och den befinner sig ungefär 326 miljoner ljusår från oss, vilket motsvarar 3x10^21 km eller 3 triljarder kilometer.
Galaxen avlägsnar sig från oss med en hastighet av ca 6000 km/sek. Den är ungefär en och en halv gång så stor som vår egen och bör innehålla runt 400-500 miljarder stjärnor.

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