NGC 1228

NGC 1228
Image illustrative de l’article NGC 1228
La galaxie lenticulaire NGC 1228
Données d’observation
(Époque J2000.0)
Constellation Éridan
Ascension droite (α) 03h 08m 11,7s[1]
Déclinaison (δ) −22° 55′ 22″ [1]
Magnitude apparente (V) 13,3 [2]
14,2 dans la Bande B[2]
Brillance de surface 13,70 mag/am2[2]
Dimensions apparentes (V) 1,6 × 0,9[2]
Décalage vers le rouge +0,034514 ± 0,000120[1]
Angle de position 77°[2]

Localisation dans la constellation : Éridan

(Voir situation dans la constellation : Éridan)
Astrométrie
Vitesse radiale 10 347 ± 36 km/s [1]
Distance 150,30 ± 10,54 Mpc (∼490 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie (R')SB(rs)0+ pec:[1] SB0-a[2]
SB0/a? pec[3]
Dimensions environ 150,5 kpc (∼491 000 al)[a],[b]
Découverte
Découvreur(s) Francis Leavenworth[3]
Date [3]
Désignation(s) ARP 332
PGC 11735
MCG -4-8-26
UGCA 54
VV 260
VV 337
ESO 480-32[2]
Liste des galaxies lenticulaires

NGC 1228 est une lointaine et très vaste galaxie lenticulaire située dans la constellation de l'Éridan. Sa vitesse par rapport au fond diffus cosmologique est de 10 190 ± 38 km/s, ce qui correspond à une distance de Hubble de 150 ± 11 Mpc (∼489 millions d'al)[1]. Elle a été découverte par l'astronome américain Francis Leavenworth en 1886.

La chaîne de galaixes Arp 332 par le projet « Legacy Surveys DR10 »[4]. De bas en haut, NGC 1230, NGC 1229 et NGC 1228.

Avec les galaxies NGC 1229, NGC 1230 et IC 1892, la galaxie NGC 1228 forme une chaine de galaxies qui figure dans l'atlas de Halton Arp sous la cote Arp 332[3].

À ce jour, une mesure non basée sur le décalage vers le rouge (redshift) donne une distance d'environ 95,700 Mpc (∼312 millions d'al)[5]. Cette valeur est très loin à l'extérieur 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.

Notes et références

Notes

  1. Les données utilisées par le site NASA/IPAC sont basées uniquement sur des publications scientifiques et, en ce qui concerne le diamètre des galaxies, elles sont parfois inexactes. Le calcul de tous les diamètres est basé sur la moyenne des mesures de distances indépendantes du décalage vers le rouge, lorsqu'elles existent. Certaines fois, l'écart type des échantillons est plus grand que la moyenne et souvent il vaudrait mieux choisir la distance de Hubble pour faire ce calcul. Ici par exemple, la seule mesure indépendante est de 97,7 Mpc et c'est probablement loin de la distance réelle de NGC 1228. Si on utilise la distance de Hubble de 150 Mpc, on obtient un diamètre d'environ 150,5 kpc (∼491 000 al) au lieu de 95,83 kpc indiqué sur le site.
  2. Diamètre isophote du relevé ESO-LV Quick Blue"" IIa-O.

Références

  1. a b c d e f et g (en) « Results for object NGC 1228 », 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 1200 à 1299 », sur astrovalleyfield.com (consulté le )
  3. a b c et d (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 1228 » (consulté le ).
  4. (en) « Iteractive Map, Current Data Release: 10.1 »
  5. « Your NED Search Results. Distance Results for NGC 1228 », sur ned.ipac.caltech.edu (consulté le )

Voir aussi

Articles connexes

Liens externes

    •  NGC 1220  •  NGC 1221  •  NGC 1222  •  NGC 1223  •  NGC 1224  •  NGC 1225  •  NGC 1226  •  NGC 1227  •  NGC 1228  •  NGC 1229  •  NGC 1230  •  NGC 1231  •  NGC 1232  •  NGC 1233  •  NGC 1234  •  NGC 1235  •  NGC 1236      

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