NGC 2012

NGC 2012
Image illustrative de l’article NGC 2012
La galaxie lenticulaire NGC 2012.
Données d’observation
(Époque J2000.0)
Constellation Table
Ascension droite (α) 05h 22m 35,3s[1]
Déclinaison (δ) −79° 51′ 07″ [1]
Magnitude apparente (V) 12,9 [2]
14,0 dans la Bande B[2]
Brillance de surface 12,45 mag/am2[2]
Dimensions apparentes (V) 1,1′ × 0,6′[2]
Décalage vers le rouge 0,016218 ± 0,000047[1]
Angle de position 117°[2]

Localisation dans la constellation : Table

(Voir situation dans la constellation : Table)
Astrométrie
Vitesse radiale 4 862 ± 14 km/s [1]
Distance 72,41 ± 5,07 Mpc (∼236 millions d'al) [1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie SA0^-?[1] E-S0[2],[3]
Dimensions environ 50,04 kpc (∼163 000 al)[1],[a]
Découverte
Découvreur(s) John Herschel[3]
Date 27 [3]
Désignation(s) PGC 17194
ESO 16-5[2]
Liste des galaxies lenticulaires
modifier 

NGC 2012 est une vaste galaxie lenticulaire située dans la constellation de la Table. Sa vitesse par rapport au fond diffus cosmologique est de 4 909 ± 14 km/s, ce qui correspond à une distance de Hubble de 72,4 ± 5,1 Mpc (∼236 millions d'al)[1]. NGC 2012 a été découverte par l'astronome britannique John Herschel en 1836[3].

À ce jour, une mesure non basée sur le décalage vers le rouge (redshift) donne une distance d'environ 77,400 Mpc (∼252 millions d'al)[4]. Cette valeur est à l'intérieur des 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 2012 pourrait être d'environ 46,8 kpc (∼153 000 al) si on utilisait la distance de Hubble pour le calculer.

Notes et références

Notes

  1. ↑ Diamètre isophote du relevé ESO-LV Quick Blue"" IIa-O.

Références

  1. ↑ a b c d e f g et h (en) « Results for object NGC 2012 », NASA/IPAC Extragalactic Database (consulté le ).
  2. ↑ a b c d e f et g (en) « Revised NGC and IC Catalog by Wolfgang Steinicke » (consulté le )
  3. ↑ a b c et d (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 2012 » (consulté le ).
  4. ↑ « Your NED Search Results. Distance Results for NGC 2012 », sur ned.ipac.caltech.edu (consulté le )

Voir aussi

Articles connexes

Liens externes

    •  NGC 2004  •  NGC 2005  •  NGC 2006  •  NGC 2007  •  NGC 2008  •  NGC 2009  •  NGC 2010  •  NGC 2011  •  NGC 2012  •  NGC 2013  •  NGC 2014  •  NGC 2015  •  NGC 2016  •  NGC 2017  •  NGC 2018  •  NGC 2019  •  NGC 2020      

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