NGC 3216

NGC 3216
Image illustrative de l’article NGC 3216
La galaxie elliptique NGC 3216.
Données d’observation
(Époque J2000.0)
Constellation Lion
Ascension droite (α) 10h 21m 41,2s[1]
Déclinaison (δ) 23° 55′ 23″ [1]
Magnitude apparente (V) 13,4 [2]
14,4 dans la Bande B[2]
Brillance de surface 13,68 mag/am2[2]
Dimensions apparentes (V) 1,3′ × 1,0′[2]
Décalage vers le rouge 0,039192 ± 0,000011[1]
Angle de position 0°[2]

Localisation dans la constellation : Lion

(Voir situation dans la constellation : Lion)
Astrométrie
Vitesse radiale 11 749 ± 3 km/s [1]
Distance 177,87 ± 12,46 Mpc (∼580 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie elliptique
Type de galaxie E?[1] E[2] E2?[3]
Dimensions environ 90,41 kpc (∼295 000 al)[1]
Découverte
Découvreur(s) William Herschel[3]
Date [3]
Désignation(s) PGC 30312
UGC 5593
MCG 4-25-7
CGCG 124-8[2]
Liste des galaxies elliptiques
modifier 

NGC 3216 est une lointaine et très vaste galaxie elliptique relativement éloignée et située dans la constellation du Lion. Sa vitesse par rapport au fond diffus cosmologique est de 12 060 ± 22 km/s, ce qui correspond à une distance de Hubble de 178 ± 12 Mpc (∼581 millions d'al)[1]. NGC 3216 a été découverte par l'astronome germano-britannique William Herschel en 1785[3].

À ce jour, une mesure non basée sur le décalage vers le rouge (redshift) donne une distance d'environ 222,000 Mpc (∼724 millions d'al)[4]. Cette valeur est à l'extérieur mais compatible avec les valeurs de la distance de Hubble. Notons cependant que c'est avec la valeur moyenne des mesures indépendantes, lorsqu'elles existent, que la base de données NASA/IPAC calcule le diamètre d'une galaxie et qu'en conséquence le diamètre de NGC 3216 pourrait être d'environ 72,4 kpc (∼236 000 al) si on utilisait la distance de Hubble pour le calculer.

Notes et références

  1. ↑ a b c d e f g et h (en) « Results for object NGC 3216 », NASA/IPAC Extragalactic Database (consulté le ).
  2. ↑ a b c d e f et g « Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 3200 à 3299 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b c et d (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 3216 » (consulté le ).
  4. ↑ « Your NED Search Results. Distance Results for NGC 3216 », sur ned.ipac.caltech.edu (consulté le )

Voir aussi

Articles connexes

Liens externes

NGC 3208  •  NGC 3209  •  NGC 3210  •  NGC 3211  •  NGC 3212  •  NGC 3213  •  NGC 3214  •  NGC 3215  •  NGC 3216  •  NGC 3217  •  NGC 3218  •  NGC 3219  •  NGC 3220  •  NGC 3221  •  NGC 3222  •  NGC 3223  •  NGC 3224

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