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Groombridge 1830 Références | Liens externes | Menu de navigation11h 52m 58.8s, +37° 43′ 07″modifierGroombridge 1830voir la liste des auteursSolStation.com: Groombridge 1830HD 103095 -- High proper-motion StarAN 19 (1842) 393/394AN 20 (1843) 163/164AN 20 (1843) 279/280m

Constellation de la Grande OurseÉtoile de type spectral GVIÉtoile nommée d'après un astronome professionnel


GJBDLTTLFTSAOGCTPHIPConsultez la documentation du modèleétoileconstellationGrande Oursesous-nainetype G8Stephen Groombridgemouvement propreFriedrich Wilhelm Argelanderannées-lumièreTerremagnitude absoluemagnitude apparentehaloSoleilétoile binairemouvement propre61 Cygniétoile de Kapteynétoile de BarnardGalaxieVoie lactée










Coordonnées : Sky map11h 52m 58.8s, +37° 43′ 07″



Groombridge 1830




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Groombridge 1830



Description de cette image, également commentée ci-après

Groombridge 1830(=HR 4550), Chi UMa et Psi UMa.










Données d'observation
(époque J2000.0)
Ascension droite
11h 52m 58,8s
Déclinaison
+37° 43′ 07″
Constellation
Grande Ourse
Magnitude apparente
6,42



Localisation dans la constellation : Grande Ourse



(Voir situation dans la constellation : Grande Ourse)

Ursa Major IAU.svg












Caractéristiques
Type spectral
G8 VIp

Indice U-B
0,17

Indice B-V
0,75
Variabilité
suspectée











Astrométrie
Vitesse radiale
−98,8 km/s
Mouvement propre
μα = 4 003,69 mas/a
μδ = −5 813,00 mas/a
Parallaxe
109,78 ± 0,70 mas
Distance
29,7 ± 0,2 al
(9,11 ± 0,06 pc)
Magnitude absolue
6,62













Caractéristiques physiques
Masse
0,6 M☉
Rayon
0,64 R☉
Luminosité
0,19 L☉
Température
5 030 K
Métallicité
3-10 %
Âge
5,4 x 109 a

Autres désignations


GJ 451, HR 4550, HD 103095, BD+38 2285, LHS 44, LTT 13276, LFT 855, SAO 62738, GCTP 2745.00, FK5 1307, HIP 57939


modifier Consultez la documentation du modèle



Groombridge 1830, aussi nommée l'étoile d'Argelander, est une étoile de la constellation de la Grande Ourse.


C'est une sous-naine jaune-orange de type G8 cataloguée par Stephen Groombridge dans les années 1830. Son mouvement propre élevé fut remarqué par Friedrich Wilhelm Argelander en 1842.


Elle est située à 29,7 années-lumière de la Terre, ce qui implique que sa magnitude absolue est presque égale à sa magnitude apparente. C'est une étoile du halo ; de telles étoiles ne représentent que 0,1 à 0,2 pourcent des étoiles voisines du Soleil.


Un temps suspectée d'être une étoile binaire avec une période de 175 jours, on considère actuellement qu'elle est seule.


Quand elle fut découverte, elle possédait le mouvement propre le plus important de toutes les étoiles connues, surpassant 61 Cygni sur ce point. Plus tard elle rétrograda à la seconde place après la découverte de l'étoile de Kapteyn, puis à la troisième place après la découverte de l'étoile de Barnard. Elle est cependant bien plus éloignée que ces deux étoiles, ce qui signifie que sa vitesse transverse est plus importante.


En réalité, c'est le Soleil qui suit le mouvement de rotation de la Galaxie en tournant autour du centre de la Voie lactée ; les étoiles du halo telles que Groombridge 1830 ne suivent pas la rotation galactique et donc sont « immobiles » et semblent se déplacer dans la « direction rétrograde » à grande vitesse.



Références |


  • Garik Israelian et al, 1998, "Oxygen Abundances in Unevolved Metal-poor Stars from Near-Ultraviolet OH Lines", Astrophysical Journal, 507, November.

  • (en) Cet article est partiellement ou en totalité issu de l’article de Wikipédia en anglais intitulé « Groombridge 1830 » (voir la liste des auteurs).


Liens externes |



  • (en) SolStation.com: Groombridge 1830


  • (en) HD 103095 -- High proper-motion Star sur la base de données Simbad du Centre de données astronomiques de Strasbourg.


Découverte de son mouvement propre élevé |



  • (de) AN 19 (1842) 393/394


  • (de) AN 20 (1843) 163/164


  • (en) AN 20 (1843) 279/280


















  • Portail de l’astronomie



Ce document provient de « https://fr.wikipedia.org/w/index.php?title=Groombridge_1830&oldid=152508552 ».













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