NGC 642

NGC 642
Image illustrative de l’article NGC 642
La galaxie spirale barrée NGC 642
Données d’observation
(Époque J2000.0)
Constellation Sculpteur
Ascension droite (α) 01h 39m 06,3s[1]
Déclinaison (δ) −29° 54′ 54″
Magnitude apparente (V) 12,3 [2]
13,0 dans la Bande B [2]
Brillance de surface 13,16 mag/am2[2]
Dimensions apparentes (V) 2,0′ × 1,1′[2]
Décalage vers le rouge +0,019624 ± 0,000023[1]
Angle de position 31°[2]

Localisation dans la constellation : Sculpteur

(Voir situation dans la constellation : Sculpteur)
Astrométrie
Vitesse radiale 5 883 ± 7 km/s [1]
Distance 83,33 ± 5,84 Mpc (∼272 millions d'al) [1]
Caractéristiques physiques
Type d'objet Galaxie spirale barrée
Type de galaxie SB(s)c[1] SBc[2] SBc?[3]
Dimensions environ 78,22 kpc (∼255 000 al)[1],[a]
Découverte
Découvreur(s) John Herschel[3]
Date [3]
Désignation(s) PGC 6112
MCG -5-5-3
ESO 413-14
AM 0136-301
VV 419 [2]
Liste des galaxies spirales barrées
modifier 

NGC 642 est une très vaste galaxie spirale barrée située dans la constellation du Sculpteur. Sa vitesse par rapport au fond diffus cosmologique est de 5 650 ± 18 km/s, ce qui correspond à une distance de Hubble de 83,3 ± 5,8 Mpc (∼272 millions d'al)[1]. NGC 642 a été découverte par l'astronome britannique John Herschel en 1834.

La classe de luminosité de NGC 642 est III et elle présente une large raie HI[1].

À ce jour, neuf mesures non basées sur le décalage vers le rouge (redshift) donnent une distance de 92,722 ± 13,476 Mpc (∼302 millions d'al)[4], ce qui est à l'intérieur 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 et qu'en conséquence le diamètre de NGC 642 pourrait être d'environ 70,3 kpc (∼229 000 al) si on utilisait la distance de Hubble pour le calculer.

Les distances de Hubble des galaxies NGC 639 et NGC 642 sont égales au centième près. C'est une paire confirmée de galaxies[1],[5].

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 642 », 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 600 à 699 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 642 » (consulté le )
  4. ↑ « Your NED Search Results, Distance Results for NGC 642 », sur ned.ipac.caltech.edu (consulté le )
  5. ↑ D. S. L. Soares, R. E. de Souza, R. R. de Carvalho et T. C. Couto da Silva, « Southern binary galaxies. I. A sample of isolated pairs. », Astronomy and Astrophysics Supplement, vol. 110,‎ , p. 371 (DOI 10.48550/arXiv.astro-ph/9410092, Bibcode 1995A&AS..110..371S, lire en ligne [PDF])

Voir aussi

Articles connexes

Liens externes

NGC 634  •  NGC 635  •  NGC 636  •  NGC 637  •  NGC 638  •  NGC 639  •  NGC 640  •  NGC 641  •  NGC 642  •  NGC 643  •  NGC 644  •  NGC 645  •  NGC 646  •  NGC 647  •  NGC 648  •  NGC 649  •  NGC 650

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