IC 1251

IC 1251
Image illustrative de l’article IC 1251
La galaxie spirale IC 1251.
Données d’observation
(Époque J2000.0)
Constellation Dragon
Ascension droite (α) 17h 10m 12,9s[1]
Déclinaison (δ) 72° 24′ 38″ [1]
Magnitude apparente (V) 13,5[2]
14,2 dans la Bande B[2]
Brillance de surface 13,94 mag/am2[2]
Dimensions apparentes (V) 1,5′ × 1,0′[2]
Décalage vers le rouge +0,004036 ± 0,000007[1]
Angle de position 71°[2]

Localisation dans la constellation : Dragon

(Voir situation dans la constellation : Dragon)
Astrométrie
Vitesse radiale 1 210 ± 2 km/s [1]
Distance 17,23 ± 1,21 Mpc (∼56,2 millions d'al)[1]
Caractéristiques physiques
Type d'objet Galaxie spirale
Type de galaxie Scd?[1] Sc[2],[3],[4]
Dimensions environ 24,95 kpc (∼81 400 al)[1]
Découverte
Découvreur(s) Edward Swift[3]
Date [3]
Désignation(s) PGC 59735
UGC 10757
MCG 12-16-21
CGCG 339-29[2]
Liste des galaxies spirales
modifier 

IC 1251 est une galaxie spirale située dans la constellation du Dragon. Sa vitesse par rapport au fond diffus cosmologique est de 1 168 ± 4 km/s, ce qui correspond à une distance de Hubble de 17,2 ± 1,2 Mpc (∼56,1 millions d'al)[1]. IC 1251 a été découvert par l'astronome américain Edward Swift en 1890.

La classe de luminosité d'IC 1251 est III-IV et elle présente une large raie HI[1].

À ce jour, deux mesures non basées sur le décalage vers le rouge (redshift) donnent une distance de 50,450 ± 1,344 Mpc (∼165 millions d'al)[5], ce qui est tout très loin à l'extérieur des valeurs de la distance de Hubble.

Un triplet de galaxies, le groupe de NGC 6340

NGC 6340, IC 1251 et IC 1254, un triplet de galaxies.

Les distances de Hubble de NGC 6340, d'IC 1251 et d'IC 1254 sont respectivement de 17,18 Mpc, 17,47 Mpc et de 17,23 Mpc. Ces trois galaxies forment donc un triplet de galaxies.

Groupe NGC 6340, avec NGC 6340 (au centre), IC 1251 et IC 1254 (respectivement, à gauche et en haut à gauche)

Notes et références

  1. ↑ a b c d e f g h et i (en) « Results for object IC 1251 », 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», IC 1900 à 1999 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b et c (en) Courtney Seligman, « Celestial Atlas Table of Contents, IC 1251 » (consulté le ).
  4. ↑ (en) « IC 1251 », HyperLeda (consulté le ).
  5. ↑ « Your NED Search Results, Distance Results for IC 1251 », sur ned.ipac.caltech.edu (consulté le )

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