NGC 439

NGC 439
Image illustrative de l’article NGC 439
La galaxie lenticulaire NGC 439
Données d’observation
(Époque J2000.0)
Constellation Sculpteur
Ascension droite (α) 01h 13m 47,2s[1]
Déclinaison (δ) −31° 44′ 50″ [1]
Magnitude apparente (V) 11,5 [2]
12,5 dans la Bande B [2]
Brillance de surface 12,94 mag/am2[2]
Dimensions apparentes (V) 2,5′ × 1,5′ [2]
Décalage vers le rouge +0,019357 ± 0,000083 [1]
Angle de position 156° [2]

Localisation dans la constellation : Sculpteur

(Voir situation dans la constellation : Sculpteur)
Astrométrie
Vitesse radiale 5 803 ± 25 km/s [1]
Distance 81,96 ± 5,75 Mpc (∼267 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie SAB0^-(rs)?[1] E/SB0[2] S0(rs)a?[3]
Dimensions environ 114,45 kpc (∼373 000 al)[1],[a]
Découverte
Découvreur(s) John Herschel[3]
Date [3]
Désignation(s) PGC 4423
MCG -5-4-15
ESO 412-18
AM 0111-320[2]
Liste des galaxies lenticulaires
modifier 

NGC 439 est une très vaste galaxie lenticulaire située dans la constellation du Sculpteur. Sa vitesse par rapport au fond diffus cosmologique est de 5 557 ± 30 km/s, ce qui correspond à une distance de Hubble de 82,0 ± 5,8 Mpc (∼267 millions d'al)[1]. NGC 439 a été découverte par l'astronome britannique John Herschel en 1834.

À ce jour, deux mesures non basées sur le décalage vers le rouge (redshift) donnent une distance de 57,950 ± 9,829 Mpc (∼189 millions d'al)[4], ce qui est 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 de NGC 439 pourrait être d'environ 162 kpc (∼528 000 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 439 », 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 400 à 499 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 439 » (consulté le )
  4. ↑ « Your NED Search Results, Distance Results for NGC 439 », sur ned.ipac.caltech.edu (consulté le )

Voir aussi

Articles connexes

Liens externes

NGC 431  •  NGC 432  •  NGC 433  •  NGC 434  •  NGC 435  •  NGC 436  •  NGC 437  •  NGC 438  •  NGC 439  •  NGC 440  •  NGC 441  •  NGC 442  •  NGC 443  •  NGC 444  •  NGC 445  •  NGC 446  •  NGC 447

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