NGC 1645

NGC 1645
Image illustrative de l’article NGC 1645
La galaxie lenticulaire NGC 1645.
Données d’observation
(Époque J2000.0)
Constellation Éridan
Ascension droite (α) 04h 44m 06,4s[1]
Déclinaison (δ) −05° 27′ 56″ [1]
Magnitude apparente (V) 13,0[2]
13,9 dans la Bande B[2]
Brillance de surface 13,69 mag/am2[2]
Dimensions apparentes (V) 2,1′ × 0,9′[2]
Décalage vers le rouge 0,016345 ± 0,000040[1]
Angle de position 85°[2]

Localisation dans la constellation : Éridan

(Voir situation dans la constellation : Éridan)
Astrométrie
Vitesse radiale 4 900 ± 12 km/s [1]
Distance 71,68 ± 5,02 Mpc (∼234 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie lenticulaire
Type de galaxie (R')SB0^+(rs) pec[1] S0-a/P[2]
S0/a?? pec[3]
Dimensions environ 47,29 kpc (∼154 000 al)[1]
Découverte
Découvreur(s) Heinrich d'Arrest[3]
Date [3]
Désignation(s) PGC 15903
UGC 3140
MCG -1-13-2
NPM1G -05.0213[2]
Liste des galaxies lenticulaires
modifier 

NGC 1645 est une vaste galaxie lenticulaire située dans la constellation de l'Éridan. Sa vitesse par rapport au fond diffus cosmologique est de 4 860 ± 12 km/s, ce qui correspond à une distance de Hubble de 71,7 ± 5,0 Mpc (∼234 millions d'al)[1]. Elle a été découverte par l'astronome prussien Heinrich d'Arrest en 1864.

Une barre centrale, un anneau externe et un anneau entourant le noyau sont clairement visibles sur l'image provenant des données du relevé SDSS. Selon la base de données Simbad, NGC 1645 est une galaxie LINER, c'est-à-dire une galaxie dont le noyau présente un spectre d'émission caractérisé par de larges raies d'atomes faiblement ionisés[4].

Groupe de NGC 1667

NGC 1645 fait partie d'un groupe de galaxies, le groupe de NGC 1667[5] qui comprend au moins 9 galaxies. Les sept autres galaxies du groupe inscrite dans l'article de A.M. Garcia paru en 1993 sont NGC 1659, IC 387, IC 2097, IC 2101, MCG -1-13-12, PGC 15779 et PGC 16061.

Notes et références

  1. ↑ a b c d e f g et h (en) « Results for object NGC 1645 », 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 1600 à 1699 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 1645 » (consulté le ).
  4. ↑ (en) « Simbad, NGC 1645 -- LINER-type Active Galaxy Nucleus » (consulté le )
  5. ↑ 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)

Voir aussi

Articles connexes

Liens externes

    •  NGC 1637  •  NGC 1638  •  NGC 1639  •  NGC 1640  •  NGC 1641  •  NGC 1642  •  NGC 1643  •  NGC 1644  •  NGC 1645  •  NGC 1646  •  NGC 1647  •  NGC 1648  •  NGC 1649  •  NGC 1650  •  NGC 1651  •  NGC 1652  •  NGC 1653      

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