HD 38858

HD 38858
Constelación Orión
Ascensión recta α 05h 48min 34,94s
Declinación δ -04º 05’ 40,7’’
Distancia 50,8 años luz
Magnitud visual +5,97
Magnitud absoluta +5,01
Luminosidad 0,86 soles
Temperatura 5730 K
Masa 0,86 soles
Radio 0,95 soles
Tipo espectral G4V
Velocidad radial -13,9 km/s

HD 38858 (HR 2007 / HIP 27435 / GJ 1085)[1]​ es una estrella en la constelación de Orión de magnitud aparente +5,97. Se encuentra a 50,8 años luz de distancia del sistema solar.

HD 38858 es una enana amarilla de tipo espectral G4V y 5730 K de temperatura efectiva.[2]​ Es un análogo solar cuyas características físicas son similares a las del Sol, con un radio de 0,95 radios solares[2]​ y una luminosidad equivalente al 86% de la luminosidad solar.[3]​ Con una masa de 0,86 masas solares,[4]​ tiene una edad estimada de 3190 millones de años,[5]​ unos 1400 millones de años menos que nuestra estrella. Su cinemática corresponde a la de una estrella del disco fino, moviéndose, al igual que el Sol, cerca del plano galáctico.[6]​ No obstante, su metalicidad, basada en la relación entre los contenidos de hierro e hidrógeno, es sólo el 57% de la que tiene el Sol.[5]

La metalicidad y cinemática de HD 38858, así como el hecho de que no se conozca ningún planeta gigante orbitando a menos de 2 UA de ella —hasta el momento no se ha descubierto ningún planeta extrasolar—, han propiciado que haya sido seleccionada entre los 25 objetivos principales del Catálogo de Sistemas Estelares Habitables del Instituto SETI.[5]

Referencias

  1. HD 38858 (SIMBAD)
  2. a b Masana, E.; Jordi, C.; Ribas, I. (2006). «Effective temperature scale and bolometric corrections from 2MASS photometry». Astronomy and Astrophysics 450 (2). pp. 735-746. 
  3. Valenti, Jeff A.; Fischer, Debra A. (2005). «Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs». The Astrophysical Journal Supplement Series 159 (1). pp. 141-166. 
  4. Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (2004). «The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs». Astronomy and Astrophysics 418. pp. 989-1019. 
  5. a b c M.C. Turnbull, J.C. Tarter (2003). «Target Selection for SETI. II. Tycho-2 Dwarfs, Old Open Clusters, and the Nearest 100 Stars». The Astrophysical Journal Supplement Series 149 (2): 423-436. doi:10.1086/379320. 
  6. Soubiran, C.; Girard, P. (2005). «Abundance trends in kinematical groups of the Milky Way's disk». Astronomy and Astrophysics 438 (1). pp. 139-151. 

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