DENIS J025503.3−470049

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DENIS J0255-4700
Données d'observation
(époque J2000.0)
Ascension droite 02h 55m 03,69271s[1]
Déclinaison −47° 00′ 51,3569″[1]
Constellation Éridan
Magnitude apparente +22,9

Localisation dans la constellation : Éridan

(Voir situation dans la constellation : Éridan)
Caractéristiques
Type spectral L 7.5
Astrométrie
Mouvement propre μα = +1 012,445 mas/a[1]
μδ = −554,031 mas/a[1]
Parallaxe 205,425 1 ± 0,185 7 mas[1]
Distance 4,867 9 ± 0,004 4 pc (∼15,9 al)[2]
Magnitude absolue 24,44
Caractéristiques physiques
Masse 0,07 M☉

Désignations

2MUCD 10158,
2MASS J02550357-4700509,
DENIS 0255-4700,
DENIS J0255.0-4700,
DENIS J025503.3-470049[2]

modifier

DENIS J025503.3−470049 ou plus souvent appelée DEN 0255−4700 est un objet céleste de masse substellaire de type spectral L — probable naine brune de type naine L — qui est situé à une distance de ∼ 15,9 a.l. (∼ 4,87 pc) du Soleil[1] dans la direction de la constellation australe de l'Éridan[3].

L'objet a été détecté grâce au programme Deep Near Infrared Survey of the Southern Sky (DENIS). Dès 1999, Martín et al. suggèrent qu'il s'agit d'une naine L (type spectral dL6) très froide (température effective de 1 600 K)[4].

DEN 0255−4700 est le 55e système le plus proche du Système solaire (connu à ce jour)[Quand ?] et c'est l'objet de type spectral L le plus proche de la Terre. Les astres de ce type sont de couleur rouge foncé et rayonnent essentiellement dans l'infrarouge.

Notes et références

  1. ↑ a b c d e et f (en) A. Vallenari et al. (Gaia collaboration), « Gaia Data Release 3 : Summary of the content and survey properties », Astronomy & Astrophysics, vol. 674,‎ , article no A1 (DOI 10.1051/0004-6361/202243940, Bibcode 2023A&A...674A...1G, arXiv 2208.00211). Notice Gaia DR3 pour cette source sur VizieR.
  2. ↑ a et b (en) DENIS J025503.3-470049 -- Brown Dwarf (M<0.08solMass) sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  3. ↑ (en) Résultats pour DENIS-P J025503.3-470049 sur l'application Compute constellation name from position de VizieR
  4. ↑ (en) Eduardo L. Martín et al., « Spectroscopic classification of late-M and L field dwarfs », The Astronomical Journal, vol. 118, no 5,‎ , p. 2466-2482 (DOI 10.1086/301107, Bibcode 1999AJ....118.2466M, lire en ligne [html], consulté le )
    Les coauteurs de l'article sont, outre Eduardo L. Martín : Xavier Delfosse, Gibor Basri, Bertrand Goldman, Thierry Forveille et Maria Rosa Zapatero Osorio.
    L'article a été reçu par la revue le 23 juin 1999 et accepté par son comité de lecture le 27 juillet 1999.

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