Un tournesol dans un champ galactique (annotée) (Corine Yahia (RIGEL33))

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: M 63 · NGC 5055 · Sunflower Galaxy

Un tournesol dans un champ galactique (annotée), Corine Yahia (RIGEL33)

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Un tournesol dans un champ galactique (annotée)

Link: https://flic.kr/p/2pAmNkK

Powered byPixInsight

Un tournesol dans un champ galactique (annotée)

Link: https://flic.kr/p/2pAmNkK

En mai 2023, lors des Nuits Astronomiques de Touraine, grâce à une météo favorable, j’ai pu pointer quelques objets célestes.

Dans l’image ci-dessus, on peut voir la galaxie du Tournesol (M63 – NGC 5055) qui semble bien isolée dans ce coin du ciel nocturne, située dans la constellation des Chiens de Chasse. Elle est à 25 millions d’années-lumière de la Terre et accuse une taille d’environ 110.000 années-lumière.
Découverte par Pierre Méchain, Charles Messier a pu la confirmer et la faire entrer dans son catalogue des objets qui ne sont pas des comètes).

Mais en regardant l’image de plus près, on peut y voir une pléiades de galaxies plus ou moins grandes. Bien sûr, les autres galaxies sont à des distances bien plus importantes que M63 mais, en regardant l’image annotée, on a l’impression que ce Tournesol se situe au milieu d’un champ de galaxies.
Cette galaxie fait toutefois partie du groupe galactique de M51 qui compte environ 10 membres. Et ce groupe de M51 fait lui aussi partie d’un amas de galaxies de M101 d’environ 120 membres. On peut vraiment dire que ce Tournesol est bien dans un champ galactique !

Photos prises les 16 et 17 mai 2023 à Tauxigny (37) – Canon 7D défiltré (avec correcteur de coma) au foyer d'une lunette 100ED sur monture Orion Sirius EQ-G motorisé (sans autoguidage ni goto).
253 poses de 60 s – ISO 3200 – 25 DOF – Traitement Siril

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Un tournesol dans un champ galactique (annotée)

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