Rozetta-köd

Rozetta-köd
Megfigyelési adatok
CsillagképMonoceros
Rektaszcenzió06h 33m 45s[1]
Deklináció+04° 59′ 54″ [1]
Távolság5200[1] ,
1600 pc
Látszó méret (V)24'×24'[1]
Látszólagos magnitúdó (V)9,0[1]
Fizikai tulajdonságok
Sugár65 fényév[1]
Más elnevezésekCaldwell 49, NGC 2237

A Rozetta-köd (más néven Caldwell 49) egy diffúz köd a Monoceros (Egyszarvú) csillagképben.

Felfedezése

A ködöt Lewis A. Swift fedezte fel 1871-ben.

Tudományos adatok

A Rozetta-köd egy emissziós, fénykibocsátó köd. A leglátványosabb mélyégobjektumok közé tartozik, mivel az objektum fényt bocsát ki magából.

A ködöt alkotó gázokat fiatal csillagaik ibolyántúli fénye gerjeszti, a gerjesztési energia pedig látható fény formájában sugárzódik ki. Ahol a gázhoz por keveredik, ott sötétebb területek jönnek létre, mivel a por elnyeli a fény egy részét. A ködről készült HST palettás színezésű felvételeken általában a vörös a kénatomok, zöld a hidrogénatomok, a kék pedig az oxigénatomok jelenlétére utal.

Megfigyelési lehetőség

Kisebb kézi távcsövekkel is megfigyelhető tiszta éjszakákon fényszennyezéstől mentes területeken. Nagyobb felbontásra alkalmas távcsövekkel finom szálas szerkezete is felismerhető.

Képek

Források

  1. a b c d e f NASA/IPAC Extragalactic Database. (Hozzáférés: 2009. február 14.)

További információk


   NGC 2235  •  NGC 2236  •  NGC 2237  •  NGC 2238  •  NGC 2239   

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