IC 1396, Elephant's Trunk Nebula et ses environs dans Céphée (Noël Donnard)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: 10 Cep) · 5 Cep) · 80 Cyg) · Azelfage (π1 Cyg · Erakis (μ Cep) · IC 1396 · The star 12 Cep · The star 14 Cep · The star 18 Cep · The star 19 Cep · The star 20 Cep · The star 9 Cep · The star Alderamin (α Cep · The star Azelfafage · The star Castula (ν Cep · The star The Garnet Star

IC 1396, Elephant's Trunk Nebula et ses environs dans Céphée, Noël Donnard

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IC 1396, Elephant's Trunk Nebula et ses environs dans Céphée

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IC 1396, Elephant's Trunk Nebula et ses environs dans Céphée

Voici IC 1396, une grande nébuleuse à émission, large de 140'x170' d'arc, soit 4 à 5 fois le diamètre de la pleine Lune. Cette région située à environ 3000 a.l. (années-lumière) de la Terre, dans la constellation de Céphée, est riche en gaz et poussières, ce qui en fait une véritable pouponnière de très jeunes étoiles. En effet, tout récemment, on a découvert plus de 100 jeunes étoiles en train de se former dans cette nébuleuse.

Elle contient en son coeur notamment la Nébuleuse de la Trompe d'éléphant (VdB 142), de structure similaire à celle des Piliers de la Création dans l'Aigle (M16).

La brillante étoile jaune, sur sa gauche, est l'Etoile Grenat ou Mu Cephei qui est une géante rouge. Sa taille gigantesque, 1260 fois plus grand que notre Soleil, explique sa visibilité à l'oeil nu à 5200 al, alors que si la Terre se trouvait déplaçée à 25 a.l. du Soleil, celui-ci serait déjà invisible à l'oeil nu.

(source Wiki et Photon Millenium)

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Astrometry.net job	6374926
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IC 1396, Elephant's Trunk Nebula et ses environs dans Céphée

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IC 1396, Elephant's Trunk Nebula et ses environs dans Céphée

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