And I

Andromeda I

Andromeda I
Données d’observation
Époque J2000.0
Ascension droite 00h 45m 43s
Déclinaison +38° 00′ 24″
Coordonnées galactiques =121,69, b=-24,85
Constellation Andromède
Vitesse radiale  ? km/s
Ellipticité 0,0
Magnitude apparente (V) 12,75±0,07
Indice de couleur (B-V) 0,80±0,02
Rougissement (B-V) 0,04
Absorption d’avant-plan (V) 0,13
Type dSph
Échelle de longueur 83,3″±0,9″ (330 pc)
Magnitude absolue (V) -11,8±0,1
Module de distance 24,55±0,08
Distance 810±30 kpc
Distance au centre de masse du Groupe local 360 kpc
Découvreur Sidney van den Bergh
Date de découverte 1972
Autres désignations And I
Nombre d’amas globulaires 0
Abondance de fer ([Fe/H]) 1,45±0,2

Andromeda I est une galaxie naine sphéroïdale. Elle fut découverte par Sidney van den Bergh en 1972 en même temps que les galaxies Andromeda II, III et IV.

Distante de 3 millions d’années-lumière, Andromeda I est une galaxie satellite de la Galaxie d’Andromède, dont elle n’est éloignée que de 150 000 années-lumière.

Liens externes


Les galaxies du Groupe local et de sa périphérie
Principaux membres : M31 (Andromède) · Voie lactée · M33 (Triangle) · Grand Nuage de Magellan (LMC) · Petit Nuage de Magellan (SMC) · M32 · NGC 6822 · IC 10

Galaxies sphéroïdales et naines sphéroïdales lumineuses : NGC 205 · NGC 185 · NGC 147 · Fornax · Sagittarius · Canis Majoris
Naines irrégulières faibles : IC 1613 · WLM · Pegasus · Aquarius · SagDIG · LGS 3 · Phoenix · Leo A
Naines sphéroïdales du groupe d’Andromède : And I · And II · And III · And V · And VI · And VII · ·
Naines sphéroïdales faibles : Leo I · Leo II · Carina · Sculptor · Draco · Tucana · Sextans · Ursa Minor · Cetus
Périphérie du Groupe Local : Cam A · UGCA 92 · NGC 3109 · GR 8 · Antlia · Sextans A · Sextans B · IC 5152 · UKS 2323-326 · ESO 249-010

  • Portail de l’astronomie Portail de l’astronomie
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