IC 4801

IC 4801
Image illustrative de l’article IC 4801
La galaxie lenticulaire IC 4801.
Données d’observation
(Époque J2000.0)
Constellation Paon
Ascension droite (α) 18h 59m 38,39s[1]
Déclinaison (δ) −64° 40′ 30,5″
Magnitude apparente (V) 12,5 [2]
13,4 dans la Bande B [2]
Brillance de surface 13,14 mag/am2[2]
Dimensions apparentes (V) 1,8′ × 1,0′ [2]
Décalage vers le rouge 0,014834 ± 0,000040[1]
Angle de position 90°[2]

Localisation dans la constellation : Paon

(Voir situation dans la constellation : Paon)
Astrométrie
Vitesse radiale 4 447 ± 12 km/s [1]
Distance 65,14 ± 4,56 Mpc (∼212 millions d'al) [1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie (R)SAB(rl)0^+[1] SAB0(r)a[3] SB0-a/R[2],[4]
Dimensions environ 38,08 kpc (∼124 000 al)[1],[a]
Découverte
Découvreur(s) DeLisle Stewart[3]
Date [3]
Désignation(s) PGC 62655
ESO 104-28 [2]
Liste des galaxies lenticulaires
modifier 

IC 4801 est une galaxie lenticulaire située dans la constellation du Paon. Sa vitesse par rapport au fond diffus cosmologique est de 4 417 ± 12 km/s, ce qui correspond à une distance de Hubble de 65,1 ± 4,6 Mpc (∼212 millions d'al)[1]. Cette galaxie a été découverte par l'astronome américain DeLisle Stewart en 1901.

À ce jour, 14 mesures non basées sur le décalage vers le rouge (redshift) donnent une distance de 46,250 ± 4,455 Mpc (∼151 millions d'al)[5], ce qui est nettement à l'extérieur des valeurs de la distance de Hubble. Notons 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 d'IC 4801 pourrait être d'environ 53,6 kpc (∼175 000 al) si on utilisait la distance de Hubble pour le calculer.

Groupe d'IC 4765

Selon A. M. Garcia IC 4801 fait partie du groupe d'IC 4765. Ce groupe de galaxies renferme au moins 31 membres dont trois du New General Catalogue et 19 de l'Index Catalogue[6].

Notes et références

Notes

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

Références

  1. ↑ a b c d e f et g (en) « Results for object IC 4801 », 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», IC 4801 à 4899 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, IC 4700 - 4759 » (consulté le ).
  4. ↑ (en) « IC 4801 », HyperLeda (consulté le )
  5. ↑ « Your NED Search Results, Distance Results for IC 4801 », sur ned.ipac.caltech.edu (consulté le )
  6. ↑ 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)

Voir aussi

Articles connexes

Liens externes

Objets de l'Index Catalogue

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