EE Leonis

Ficha d'oxetu celesteEE Leonis
Estrella variable[1], Estrella variable BY Draconis (es) Traducir[1] y fonte d'infrarroxos[1]
Datos d'observación
Ascensión reuta (α) 162,71679683363 °[2]
Declinación (δ) 6,8081287728825 °[2]
Distancia a la Tierra 22,4 ly
6,9688 pc
Magnitú aparente (V) 11,675 (banda V)
Magnitú absoluta 12,47[3]
Constelación Lleo[4]
Velocidá radial −1,161 km/s[5]
Parallax 143,4971 mas[2]
Carauterístiques físiques
Radiu 0,11 Radius solars
Masa 0,2 M☉[6]
Gravedá superficial 107 000 cm/s²[1]
Tipu espectral M5.0V C[7], M4.5V[8] y M4.0V[8]
Otros nomes
Cambiar los datos en Wikidata

Coordenaes: Sky map 10h 50m 52.031s, 6° 48 29.264

EE Leonis (GJ 402 / HIP 53020 / LHS 294 / Wolf 358)[9] ye una estrella asitiada a 22,2 años lluz del Sistema Solar. Alcontrada na constelación de Lleo, ye davezu conocida tantu pol so denominación de variable (EE Lleo) como pol so númberu de catálogu Gliese (Gliese 402). Los sistemes estelares más próximos a ella son Gliese 393, a 3,43 años lluz, Gliese 408, a 6,26 años lluz, y Gliese 382, a 6,66 años lluz.[10]

EE Leonis ye, como la gran mayoría de les estrelles de la nuesa redolada, una nana colorada de rellumu débil. Con magnitú aparente +11,66,[9] namái ye observable utilizando telescopiu. Pertenez al tipu espectral M5.0V[9] y tien una temperatura efectivo de 3038 K.[11] Les sos carauterístiques físiques son asemeyaes a les de Ross 128 o Kruger 60 B. La so masa equival a una cuarta parte de la masa del Sol y tien un terciu del so diámetru.[12] La so lluminosidá namái supón el 0,091% de la lluminosidá solar.[13] Xira sobre sigo mesma con una velocidá de rotación proyeutada igual o inferior a 2,3 km/s.[11] Tien un conteníu de metales llixeramente inferior al del Sol, aproximao'l 87% del mesmu.[14] La so edá envalórase ente 150 y 300 millones d'años.[15]

EE Leonis ye miembru de l'Asociación estelar de AB Doradus, l'asociación estelar más cercana a nós. Otros miembros d'esta asociación son AB Doradus —que da nome al grupu— y HD 25457.[16]

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Referencies

  1. 1,0 1,1 1,2 1,3 Afirmao en: SIMBAD.
  2. 2,0 2,1 2,2 2,3 Afirmao en: Gaia DR2. Llingua de la obra o nome: inglés. Data d'espublización: 25 abril 2018.
  3. 3,0 3,1 3,2 URL de la referencia: http://wwwadd.zah.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00824.htm.
  4. Afirmao en: VizieR. Llingua de la obra o nome: inglés.
  5. M. Lampón (abril 2018). «The CARMENES search for exoplanets around M dwarfs. High-resolution optical and near-infrared spectroscopy of 324 survey stars» (n'inglés). Astronomy and Astrophysics:  páxs. 49–49. doi:10.1051/0004-6361/201732054. 
  6. URL de la referencia: http://www.recons.org/TOP100.posted.htm.
  7. URL de la referencia: http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=EE+Leonis.
  8. 8,0 8,1 A. Klutsch (mayu 2015). «CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS» (n'inglés). Astronomy and Astrophysics:  páxs. 128–128. doi:10.1051/0004-6361/201525803. 
  9. 9,0 9,1 9,2 LHS 294 (SIMBAD)
  10. Stars within 15 light-years of Wolf 358 (The Internet Stellar Database)
  11. 11,0 11,1 Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. (2009). «Rotational Velocities for M Dwarfs». The Astrophysical Journal 704 (2). páxs. 975-988. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009ApJ...704..975J&db_key=AST&nosetcookie=1. 
  12. Catalogue of Stellar Diameters (CADARS)
  13. Wolf 358 (The Internet Stellar Database)
  14. Bonfils, X.; Delfosse, X.; Udry, S.; Santos, N. C.; Forveille, T.; Ségransan, D. (2005). «Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence». Astronomy and Astrophysics 442 (2). páxs. 635-642. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...442..635B&db_key=AST&nosetcookie=1. 
  15. Lafrenière, David; Doyon, René; Marois, Christian; Nadeau, Daniel; Oppenheimer, Ben R.; Roche, Patrick F.; Rigaut, François; Graham, James R.; Jayawardhana, Ray; Johnstone, Doug; Kalas, Paul G.; Macintosh, Bruce; Racine, René (2007). «The Gemini Deep Planet Survey». The Astrophysical Journal 670 (2). páxs. 1367-1390. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007ApJ...670.1367L&db_key=AST&nosetcookie=1. 
  16. Nakajima, Tadashi; Morino, Jun-Ichi; Fukagawa, Misato (2010). «Potential Members of Stellar Kinematical Groups within 20 pc of the Sun». The Astronomical Journal 140 (3). páxs. 713-722. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2010AJ....140..713N&db_key=AST&nosetcookie=1. 

Coordenaes: Sky map 10h 50m 52.031s, 6° 48 29.264

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