NGC 3458

NGC 3458
Image illustrative de l’article NGC 3458
La galaxie lenticulaire NGC 3458
Données d’observation
(Époque J2000.0)
Constellation Grande Ourse
Ascension droite (α) 10h 56m 01,5s[1]
Déclinaison (δ) 57° 07′ 01″ [1]
Magnitude apparente (V) 12,3 [2]
13,3 dans la Bande B[2]
Brillance de surface 12,42 mag/am2[2]
Dimensions apparentes (V) 1,4′ × 0,8′[2]
Décalage vers le rouge 0,006261 ± 0,000017[1]
Angle de position 5°[2]

Localisation dans la constellation : Grande Ourse

(Voir situation dans la constellation : Grande Ourse)
Astrométrie
Vitesse radiale 1 877 ± 5 km/s [1]
Distance 30,07 ± 2,11 Mpc (∼98,1 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie SAB0?[1] SB0[2]
Dimensions environ 12,01 kpc (∼39 200 al)[1]
Découverte
Découvreur(s) William Herschel[3]
Date [3]
Désignation(s) PGC 32854
UGC 6037
MCG 10-16-26
CGCG 291-14[2]
Liste des galaxies lenticulaires
modifier 

NGC 3458 est une galaxie lenticulaire située dans la constellation de la Grande Ourse. Sa vitesse par rapport au fond diffus cosmologique est de 2 039 ± 12 km/s, ce qui correspond à une distance de Hubble de 30,1 ± 2,1 Mpc (∼98,2 millions d'al)[1]. NGC 3458 a été découverte par l'astronome germano-britannique William Herschel en 1793.

À ce jour, une mesure non basée sur le décalage vers le rouge (redshift) donne une distance d'environ 29,500 Mpc (∼96,2 millions d'al)[4]. Cette valeur est à l'intérieur des valeurs de la distance de Hubble

Supernova

La supernova 1991F a été découverte dans NGC 3458 le par l'astronome américaine Jean Mueller de l'observatoire Palomar. Cette supernova était de type I[5].

Groupe de NGC 3445

NGC 3458 fait partie du groupe de NGC 3445. Ce groupe comprend au moins trois autres galaxies : NGC 3440, NGC 3445 et MCG 10-16-24[6]. Abraham Mahtessian mentionne aussi ce groupe dans un article parue en 1998, mais la galaxie MCG 10-16-24 n'y figure pas[7].

Notes et références

  1. ↑ a b c d e f g et h (en) « Results for object NGC 3458 », 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 3400 à 3499 », sur astrovalleyfield.com (consulté le )
  3. ↑ a et b (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 3458 » (consulté le ).
  4. ↑ « Your NED Search Results. Distance Results for NGC 3458 », sur ned.ipac.caltech.edu (consulté le )
  5. ↑ (en) « Other Supernovae images » (consulté le )
  6. ↑ A.M. Garcia, « General study of group membership. II - Determination of nearby groups », Astronomy and Astrophysics Supplement Series, vol. 100 #1,‎ , p. 47-90 (Bibcode 1993A&AS..100...47G)
  7. ↑ 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 )

Voir aussi

Articles connexes

Liens externes

    •  NGC 3450  •  NGC 3451  •  NGC 3452  •  NGC 3453  •  NGC 3454  •  NGC 3455  •  NGC 3456  •  NGC 3457  •  NGC 3458  •  NGC 3459  •  NGC 3460  •  NGC 3461  •  NGC 3462  •  NGC 3463  •  NGC 3464  •  NGC 3465  •  NGC 3466      

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