NGC 6398

NGC 6398
Image illustrative de l’article NGC 6398
La galaxie spirale barrée NGC 6398.
Données d’observation
(Époque J2000.0)
Constellation Paon
Ascension droite (α) 17h 42m 43,7s[1]
Déclinaison (δ) −61° 41′ 39″ [1]
Magnitude apparente (V) 12,7[2]
13,6 dans la Bande B[2]
Brillance de surface 14,03 mag/am2[2]
Dimensions apparentes (V) 2,0′ × 0,7′[2]
Décalage vers le rouge 0,017892 ± 0,000000[1]
Angle de position 6°[2]

Localisation dans la constellation : Paon

(Voir situation dans la constellation : Paon)
Astrométrie
Vitesse radiale 5 364 ± 0 km/s [1]
Distance 79,36 ± 5,55 Mpc (∼259 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie spirale barrée
Type de galaxie (R)SB(r)a[1],[3] SBa[2] SBa/R[4]
Dimensions environ 81,40 kpc (∼265 000 al)[1],[a]
Découverte
Découvreur(s) John Herschel[3]
Date [3]
Désignation(s) PGC 60735
ESO 139-18
AM 1738-614[2]
Liste des galaxies spirales barrées
modifier 

NGC 6398 est une très vaste galaxie spirale barrée entourée d'un anneau et située dans la constellation du Paon. Sa vitesse par rapport au fond diffus cosmologique est de 5 380 ± 1 km/s, ce qui correspond à une distance de Hubble de 79,4 ± 5,6 Mpc (∼259 millions d'al)[1]. NGC 6398 a été découverte par l'astronome britannique John Herschel en .

NGC 6398 a été utilisée par Gérard de Vaucouleurs comme une galaxie de type morphologique (R)SB(l)a dans son atlas des galaxies[5],[6].

La classe de luminosité de NGC 6398 est I[1].

Avec une brillance de surface égale à 14,03 mag/am2, on peut qualifier NGC 6398 de galaxie à faible brillance de surface (LSB en anglais pour low surface brightness). Les galaxies LSB sont des galaxies diffuses (D) avec une brillance de surface inférieure de moins d'une magnitude à celle du ciel nocturne ambiant.

Notes et références

Notes

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

Références

  1. ↑ a b c d e f g h et i (en) « Results for object NGC 6398 », 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 6300 à 6399 », sur astrovalleyfield.com (consulté le ).
  3. ↑ a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 6398 » (consulté le ).
  4. ↑ (en) « NGC 6398 », HyperLeda (consulté le ).
  5. ↑ Atlas des galaxies de Vaucouleurs sur le site du professeur Seligman, NGC 6398
  6. ↑ (en) « The Galaxy Morphology Website, NGC 6398 » (consulté le )

Voir aussi

Articles connexes

Liens externes

    •  NGC 6390  •  NGC 6391  •  NGC 6392  •  NGC 6393  •  NGC 6394  •  NGC 6395  •  NGC 6396  •  NGC 6397  •  NGC 6398  •  NGC 6399  •  NGC 6400  •  NGC 6401  •  NGC 6402  •  NGC 6403  •  NGC 6404  •  NGC 6405  •  NGC 6406      

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