Groupe d'ESO 185-54

Groupe d'ESO 185-54
Données d’observation
(Époque B1950.0)
Constellation Télescope & Paon
Ascension droite (α) 20h 01m 43,9s[1]
Déclinaison (δ) −56° 08′ 12″ [1]

Localisation dans la constellation : Télescope

(Voir situation dans la constellation : Télescope)
Astrométrie
Distance 63,1 ± 1,7 Mpc (∼206 millions d'al)
Caractéristiques physiques
Type d'objet Groupe de galaxies
Liste des groupes de galaxies
modifier 

Le groupe d'ESO 185-54 comprend au moins neuf galaxies situées dans les constellations du Télescope et du Paon. La distance moyenne entre ce groupe et la Voie lactée est d'environ 63,1 Mpc (∼206 millions d'al).

Membres

Le tableau ci-dessous liste les neuf galaxies du groupe indiquées dans l'article de A.M. Garcia paru en 1993[2].

Membres du groupe d'ESO 185-54
Nom Constellation Class. Type α (J2000.0) δ (J2000.0) Vitesse radiale (km/s) m Distance (Mpc) Diamètre (kal)
NGC 6848 Télescope Sa Spirale 20h 02m 47.25s -56° 05′ 25.1″ 4392 ± 21 12,1[3] 63,3 ± 4,4 258
NGC 6855 Télescope (R')SB0^+(rs)? Lenticulaire 20h 06m 49.91s -56° 23′ 23.7″ 4331 ± 23 12,9[3] 62,4 ± 4,4 165
NGC 6862 Télescope SB(rs)b Spirale barrée 20h 08m 54.580s -56° 23′ 30.30″ 4205 ± 5 12,7[3] 60,5 ± 4,2 137
NGC 6867 Télescope SB(rs)bc? Spirale barrée 20h 10m 29.66s -54° 46′ 59.7″ 4417 ± 7 13,1[3] 63,5 ± 4,5 115
IC 4935 Paon (R')SB(r)a? Spirale barrée 20h 04m 34.12s -57° 35′ 53.4″ 4575 ± 20 12,9[4] 66,1 ± 4,6 126
IC 4950 Télescope SB(s)bc Spirale barrée 20h 08m 27.36s -56° 09′ 42.6″ 4330 ± 10 12,9[4] 62,3 ± 4,4 85
IC 4952 Télescope Sa? Spirale 20h 08m 37.65s -55° 27′ 13.2″ 4275 ± 26 13,1[4] 61,5 ± 4,3 84
IC 4963 Télescope (R')SAB(rs)a pec? Spirale intermédiaire 20h 12m 05.49s -55° 14′ 45.2″ 4501 ± 29 13,3[4] 64,7 ± 4,6 213
ESO 185-54 Télescope E2 Elliptique 20h 03m 27.03s -55° 56′ 49.8″ 4434 ± 26 10,57 ± 0,09 63,9 ± 4,5 328

Le site DeepskyLog[5] permet de trouver aisément les constellations des galaxies mentionnées dans ce tableau ou si elles ne s'y trouvent pas, l'outil du site constellation[6] permet de le faire à l'aide des coordonnées de la galaxie. Sauf indication contraire, les données proviennent du site NASA/IPAC[7].

Notes et références

  1. ↑ a et b Le centre de masse du groupe indiqué dans l'article de Garcia (B1950.0).
  2. ↑ A.M. Garcia, « General study of group membership. II - Determination of nearby groups », Astronomy and Astrophysics Supplement Series, vol. 100 #1,‎ , p. 47-90 (Bibcode 1993A&AS..100...47G)
  3. ↑ a b c et d « Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 6800 à 6899 », sur astrovalleyfield.com (consulté le )
  4. ↑ a b c et d « Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», IC 4900 à 4999 », sur astrovalleyfield.com (consulté le )
  5. ↑ « DeepskyLog ».
  6. ↑ « Finding the constellation which contains given sky coordinates », sur djm.cc.
  7. ↑ (en) « NASA/IPAC Extragalactic Database »

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