NGC 3577

NGC 3577
Image illustrative de l’article NGC 3577
La galaxie spirale barrée NGC 3577
Données d’observation
(Époque J2000.0)
Constellation Grande Ourse
Ascension droite (α) 11h 13m 44,9s[1]
Déclinaison (δ) 48° 16′ 22″ [1]
Magnitude apparente (V) 13,4 [2]
14,3 dans la Bande B [2]
Brillance de surface 13,87 mag/am2[2]
Dimensions apparentes (V) 1,4 × 1,1[2]
Décalage vers le rouge 0,017789 ± 0,000010[1]
Angle de position 179°[2]

Localisation dans la constellation : Grande Ourse

(Voir situation dans la constellation : Grande Ourse)
Astrométrie
Vitesse radiale 5 333 ± 3 km/s [1]
Distance 81,78 ± 5,73 Mpc (∼267 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie spirale barrée
Type de galaxie SB(r)a[1] SBa[2] SBa-R[3]
Dimensions environ 39,46 kpc (∼129 000 al)[1],[a]
Découverte
Découvreur(s) William Herschel[4]
Date [4]
Désignation(s) PGC 34195
UGC 6257
MCG 8-21-6
CGCG 242-10
NPM1G +48.0180 [2]
Liste des galaxies spirales barrées

NGC 3577 est une galaxie spirale barrée située dans la constellation de la Grande Ourse. Sa vitesse par rapport au fond diffus cosmologique est de 5 544 ± 15 km/s, ce qui correspond à une distance de Hubble de 81,8 ± 5,7 Mpc (∼267 millions d'al)[1]. NGC 3577 a été découverte par l'astronome germano-britannique William Herschel en 1788.

La classe de luminosité de NGC 3577 est I et elle présente une large raie HI[1].

Selon Vaucouleurs et Corwin, NGC 3577 et NGC 3583 forment une paire de galaxies[5]. Il s'agit d'une paire optique, car la galaxie NGC 3583 est beaucoup plus rapprochée de la Voie lactée, à seulement 29,8 Mpc. Ces deux galaxies constituent donc une paire purement optique et elles ne sont pas en interaction.

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 3577 », 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 3500 à 3599 », sur astrovalleyfield.ca (consulté le )
  3. (en) « NGC 3577 sur HyperLeda » (consulté le )
  4. a et b (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 3577 » (consulté le ).
  5. (en) de Vaucouleurs, G., de Vaucouleurs, A., and Corwin, H.G., Second Reference Catalogue of Bright Galaxies, Austin, University of Texas Press, , 387 p. (lire en ligne), page 287

Voir aussi

Articles connexes

Liens externes

    •  NGC 3569  •  NGC 3570  •  NGC 3571  •  NGC 3572  •  NGC 3573  •  NGC 3574  •  NGC 3575  •  NGC 3576  •  NGC 3577  •  NGC 3578  •  NGC 3579  •  NGC 3580  •  NGC 3581  •  NGC 3582  •  NGC 3583  •  NGC 3584  •  NGC 3585      

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