About: 31 Vulpeculae

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31 Vulpeculae is a binary star system in the northern constellation of Vulpecula. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.56. The system is located approximately 228 light years away from the Sun based on parallax, and it is drifting further away with a radial velocity of +2.25 km/s.

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dbo:abstract
  • 31 Vulpeculae is a binary star system in the northern constellation of Vulpecula. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.56. The system is located approximately 228 light years away from the Sun based on parallax, and it is drifting further away with a radial velocity of +2.25 km/s. The variable radial velocity of this system was first suspected by German Astronomer Friedrich Küstner in 1914. The system appears as a single-lined spectroscopic binary with an orbital period of 5.1 years and an eccentricity of 0.38. The a sin i value for the primary is 103.0 ± 1.1 Gm (0.69 ± 0.01 AU), where a is the semimajor axis and i is the (unknown) orbital inclination. This value provides a lower bound on the actual semimajor axis for the orbit. The primary component is an aging giant star with a stellar classification of G7IIIa Fe-1 Ba, indicating a mild barium star with an underabundance of iron. Having exhausted the supply of hydrogen at its core, it has expanded to eight times the Sun's radius. It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. This is a suspected variable star with a magnitude that varies from 3.77 to 4.08 in the I passband. It is about 700 million years old with 2.4 times the mass of the Sun. The star is radiating 53 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,261 K. The companion may be a degenerate white dwarf with about 0.4 M☉. (en)
  • 31 Vulpeculae (31 Vul / HD 198809 / HR 7995)​​ es la cuarta estrella más brillante de la constelación de Vulpecula —la zorra—, tras Anser (α Vulpeculae), 23 Vulpeculae y 13 Vulpeculae. De magnitud aparente +4,58, no posee nombre propio ni denominación de Bayer, siendo conocida fundamentalmente por su número de Flamsteed. 31 Vulpeculae es una gigante amarilla de tipo espectral G7III​ con una temperatura superficial aproximada de 5113 K.Su luminosidad es 54 veces mayor que la luminosidad solar y presenta un contenido metálico inferior al solar ([Fe/H] = -0,14).​Mediante interferometría se ha medido en banda K su diámetro angular (1,51 milisegundos de arco),​ lo que permite evaluar su diámetro, que resulta ser 11 veces más grande que el del Sol.Gira sobre sí misma con una velocidad de rotación proyectada entre 5,9 y 6,7 km/s.​ 31 Vulpeculae tiene una masa —estimada a partir de la temperatura efectiva determinada mediante espectroscopia— de 2,6 masas solares​ y una edad aproximada de 720 millones de años.​Sus características son semejantes a las de Vindemiatrix (ε Virginis), Aldhibain (η Draconis) o δ Bootis.Sin embargo, al estar a 216 años luz del Sistema Solar, su brillo es menor que el de cualquiera de ellas. (es)
  • 31 Vulpeculae (r Vulpeculae) é uma estrela na direção da Vulpecula. Possui uma ascensão reta de 20h 52m 07.73s e uma declinação de +27° 05′ 49.7″. Sua magnitude aparente é igual a 4.56. Considerando sua distância de 216 anos-luz em relação à Terra, sua magnitude absoluta é igual a 0.45. Pertence à classe espectral G8III. (pt)
  • 31 Vulpeculae, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den norra delen av stjärnbilden Räven. Den har en kombinerad skenbar magnitud på minst ca 4,56 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 14,3 mas, beräknas den befinna sig på ett avstånd på ca 228 ljusår (ca 70 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 2,3 km/s. (sv)
  • 狐狸座31,又名BD+26 4017,HD 198809、SAO 89228、HR 7995,是狐狸座的一颗恒星,视星等为4.59,位于銀經71.31,銀緯-10.98,其B1900.0坐标为赤經20h 47m 50.8s,赤緯+26° -10.98′ 21″。 (zh)
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  • 1079521507 (xsd:integer)
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dbp:absmagV
  • 0.770000 (xsd:double)
dbp:appmagV
  • 4.560000 (xsd:double)
dbp:axisUnitless
  • (en)
dbp:bV
  • +0.82 (en)
dbp:class
  • G7IIIa Fe-1 Ba (en)
dbp:component
  • 31 (xsd:integer)
dbp:constell
dbp:epoch
  • J2000 (en)
dbp:luminosity
  • 52.530000 (xsd:double)
dbp:pError
  • 0.186400 (xsd:double)
dbp:parallax
  • 14.279600 (xsd:double)
dbp:propMoDec
  • −56.360 (en)
dbp:propMoRa
  • −70.902 (en)
dbp:radialV
  • +2.25 (en)
dbp:type
  • horizontal branch (en)
dbp:uB
  • +0.46 (en)
dbp:variable
  • suspected (en)
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rdfs:comment
  • 31 Vulpeculae (r Vulpeculae) é uma estrela na direção da Vulpecula. Possui uma ascensão reta de 20h 52m 07.73s e uma declinação de +27° 05′ 49.7″. Sua magnitude aparente é igual a 4.56. Considerando sua distância de 216 anos-luz em relação à Terra, sua magnitude absoluta é igual a 0.45. Pertence à classe espectral G8III. (pt)
  • 31 Vulpeculae, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna belägen i den norra delen av stjärnbilden Räven. Den har en kombinerad skenbar magnitud på minst ca 4,56 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 14,3 mas, beräknas den befinna sig på ett avstånd på ca 228 ljusår (ca 70 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 2,3 km/s. (sv)
  • 狐狸座31,又名BD+26 4017,HD 198809、SAO 89228、HR 7995,是狐狸座的一颗恒星,视星等为4.59,位于銀經71.31,銀緯-10.98,其B1900.0坐标为赤經20h 47m 50.8s,赤緯+26° -10.98′ 21″。 (zh)
  • 31 Vulpeculae is a binary star system in the northern constellation of Vulpecula. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.56. The system is located approximately 228 light years away from the Sun based on parallax, and it is drifting further away with a radial velocity of +2.25 km/s. (en)
  • 31 Vulpeculae (31 Vul / HD 198809 / HR 7995)​​ es la cuarta estrella más brillante de la constelación de Vulpecula —la zorra—, tras Anser (α Vulpeculae), 23 Vulpeculae y 13 Vulpeculae. De magnitud aparente +4,58, no posee nombre propio ni denominación de Bayer, siendo conocida fundamentalmente por su número de Flamsteed. (es)
rdfs:label
  • 31 Vulpeculae (en)
  • 31 Vulpeculae (es)
  • 31 Vulpeculae (pt)
  • 31 Vulpeculae (sv)
  • 天津增廿四 (zh)
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