Andromède IV

Andromeda IV
Image illustrative de l’article Andromède IV
Données d’observation
(Époque J2000.0)
Constellation Andromède
Ascension droite (α) 00h 42m 0s
Déclinaison (δ) +40° 34′ 0″
Magnitude apparente (V) ?
Dimensions apparentes (V) ?

Localisation dans la constellation : Andromède

(Voir situation dans la constellation : Andromède)
Astrométrie
Distance 2 900 000 à 26 000 000 al
(890 000 à 8 000 000 pc)
Caractéristiques physiques
Type d'objet Galaxie irrégulière ?
Irr?
Masse M
Dimensions ?
(? pc)
Magnitude absolue ?
Couleur (B-V) 0,062
Découverte
Découvreur(s) Sidney van den Bergh
Date 1972
Désignation(s) And IV,
Liste des objets célestes

Andromeda IV est une possible galaxie irrégulière qui pourrait faire partie de notre Groupe local, ou bien une galaxie nettement plus lointaine, ou même un amas ouvert de la Galaxie d'Andromède. Découverte par Sidney van den Bergh en 1972 en même temps que les galaxies Andromeda I, II et III, sa nature exacte est toujours sujette à caution.

Les premières estimations de distance d'Andromeda IV conduisaient à 2,9 millions d’années-lumière du Système solaire, ce qui la placerait dans le voisinage immédiat de la Galaxie d'Andromède. En 2000, des mesures effectuées à l'aide du télescope spatial Hubble la placent plutôt entre 16 et 26 millions d'années-lumière, ce qui en ferait un objet largement extérieur au Groupe local.

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