NGC 501

NGC 502
Image illustrative de l’article NGC 501
La galaxie lenticulaire NGC 502
Données d’observation
(Époque J2000.0)
Constellation Poissons
Ascension droite (α) 01h 22m 55,5s[1]
Déclinaison (δ) 09° 02′ 57″ [1]
Magnitude apparente (V) 12,8 [2]
13,7 dans la Bande B [2]
Brillance de surface 12,90 mag/am2[2]
Dimensions apparentes (V) 1,1 × 1,0 [2]
Décalage vers le rouge +0,008419 ± 0,000017 [1]
Angle de position 66° [2]

Localisation dans la constellation : Poissons

(Voir situation dans la constellation : Poissons)
Astrométrie
Vitesse radiale 2 524 ± 5 km/s [1]
Distance 32,61 ± 2,31 Mpc (∼106 millions d'al) [1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie SA0^0(r)[1] S0[2] SA0(r)?[3]
Dimensions environ 15,14 kpc (∼49 400 al)[1],[a]
Découverte
Découvreur(s) Heinrich d'Arrest[3]
Date [3]
Désignation(s) PGC 5034
MCG 1-4-43
UGC 922
CGCG 411-40 [2]
Liste des galaxies lenticulaires

NGC 502 est une galaxie lenticulaire située dans la constellation des Poissons. Sa vitesse par rapport au fond diffus cosmologique est de 2 211 ± 22 km/s, ce qui correspond à une distance de Hubble de 32,6 ± 2,3 Mpc (∼106 millions d'al)[1]. NGC 502 a été découverte par l'astronome prussien Heinrich d'Arrest en 1862.

NGC 502 est une galaxie brillante en rayon X[1].

À ce jour, une mesure non basée sur le décalage vers le rouge (redshift) donne une distance d'environ 34,700 Mpc (∼113 millions d'al)[4]. Cette valeur est à l'intérieur des valeurs de la distance de Hubble.

Groupe de NGC 470

NGC 502 appartient au groupe de NGC 470 qui comprend au moins 13 galaxies. Ce groupe comprend les galaxies NGC 470, NGC 474, NGC 485, NGC 488, NGC 489, NGC 502, NGC 516, NGC 518, NGC 520, NGC 522, NGC 524, NGC 525 et NGC 532[5].

Le groupe de NGC 470 devrait comprendre au moins 4 autres galaxies brillantes dans le domaine des rayons X[6] (NGC 509, IC 101, IC 114 et CGCG 411-0458 (PGC 4994)) car elles sont dans la même région de la sphère céleste et à des distances similaires à celles du groupe.

Notes et références

Notes

  1. Diamètre dans la bande POSS1 103a-O.

Références

  1. a b c d e f g h et i (en) « Results for object NGC 502 », 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 500 à 599 », sur astrovalleyfield.ca (consulté le )
  3. a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 502 » (consulté le )
  4. « Your NED Search Results. Distance Results for NGC 502 », sur ned.ipac.caltech.edu (consulté le )
  5. Abraham Mahtessian, « Groups of galaxies. III. Some empirical characteristics », Astrophysics, vol. 41 #3,‎ , p. 308-321 (DOI 10.1007/BF03036100, lire en ligne, consulté le )
  6. Chandreyee Sengupta et Ramesh Balasubramanyam, « HI content in galaxies in loose groups », Monthly Notices of the Royal Astronomical Society, vol. 369 #1,‎ , p. 360-368 (DOI 10.1111/j.1365-2966.2006.10307.x, Bibcode 2006MNRAS.369..360S, lire en ligne)

Voir aussi

Articles connexes

Liens externes

    •  NGC 494  •  NGC 495  •  NGC 496  •  NGC 497  •  NGC 498  •  NGC 499  •  NGC 500  •  NGC 501  •  NGC 502  •  NGC 503  •  NGC 504  •  NGC 505  •  NGC 506  •  NGC 507  •  NGC 508  •  NGC 509  •  NGC 510      

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