HIP 57050

HIP 57050
Constelación Osa Mayor
Ascensión recta α 11h 41min 44,63s
Declinación δ +42º 45’ 07,1’’
Distancia 35,9 ± 1,3 años luz
Magnitud visual +11,88
Magnitud absoluta +11,66
Temperatura 3190 K
Luminosidad 0,015 soles
Masa 0,34 soles
Radio 0,4 soles
Tipo espectral M4V
Velocidad radial -25,6 km/s

HIP 57050 (GJ 1148 / LHS 3257 / G 122-40 / Ross 1003)[1]​ es una estrella de magnitud aparente +11,88. Se localiza en la constelación de la Osa Mayor a poco más de 1º grado al sur de 59 Ursae Majoris. Desde 2010 se conoce la existencia de un planeta extrasolar en órbita alrededor de esta estrella.[2]​

HIP 57050 es una enana roja de tipo espectral M4V con una temperatura efectiva de 3190 K.[3]​ De características semejantes a las de la estrella de Barnard o Ross 128, brilla con una luminosidad bolométrica —en todo el espectro electromagnético— equivalente al 1,5% de la luminosidad solar. Tiene una masa estimada de 0,34 ± 0,03 masas solares. Con un radio aproximadamente igual al 40 % del radio solar, su período de rotación es de 98 días. Posee una metalicidad del orden de dos veces la del Sol ([Fe/H] = +0,32 ± 0,06), estando entre las más altas del entorno solar inmediato.[2]​

HIP 57050 está situada a 35,9 años luz del sistema solar y a 6,9 años luz de Groombridge 1830 y 61 Ursae Majoris.[4]​ Al igual que Gliese 832, Gliese 849 y Gliese 581 —esta última con seis planetas— es una enana roja que alberga un sistema planetario.

Sistema planetario

En 2010 se anunció el descubrimiento de un planeta en torno a HIP 57050, denominado HIP 57050 b o G 122-40 b, cuya masa es similar a la de Saturno. La separación media con la estrella es de 0,16 UA, siendo la órbita notablemente excéntrica (ε = 0,31). Dicha órbita cae dentro de la zona habitable de HIP 57050, siendo la temperatura estimada del planeta de aproximadamente 230 K.[2]​

Acompañante
(En orden desde la estrella) 		Masa
(MJ) 		Período orbital
(días) 		Semieje mayor
(UA) 		Excentricidad
HIP 57050 b > 0,298 ± 0,025 41,397 ± 0,016 0,163506 ± 4,2 × 10-5 0,314 ± 0,086

Véase también

Referencias

  1. ↑ LHS 2443 -- High proper-motion Star (SIMBAD)
  2. ↑ a b c Haghighipour, Nader; Vogt, Steven S.; Butler, R. Paul; Rivera, Eugenio J.; Laughlin, Greg; Meschiari, Stefano; Henry, Gregory W. (2010). «The Lick-Carnegie Exoplanet Survey: A Saturn-Mass Planet in the Habitable Zone of the Nearby M4V Star HIP 57050». The Astrophysical Journal 715 (1). pp. 271-276. 
  3. ↑ Morales, J. C.; Ribas, I.; Jordi, C. (2008). «The effect of activity on stellar temperatures and radii». Astronomy and Astrophysics 478 (2). pp. 507-512 (Tabla consultada en CDS). 
  4. ↑ Stars within 15 light-years of Ross 1003 (The Internet Stellar Database)

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