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About: HD 81799

An Entity of Type: star, from Named Graph: http://dbpedia.org, within Data Space: dbpedia.org

HD 81799 (G Hydrae) is a suspected astrometric binary star system in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.69. The distance to this system, as determined from an annual parallax shift of 19.9 mas, is 164 light years. It is moving further away from the Earth with a heliocentric radial velocity of 29 km/s. The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 233±19 mas/yr along a position angle of 136°.

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dbo:abstract
  • HD 81799 (G Hydrae) is a suspected astrometric binary star system in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.69. The distance to this system, as determined from an annual parallax shift of 19.9 mas, is 164 light years. It is moving further away from the Earth with a heliocentric radial velocity of 29 km/s. The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 233±19 mas/yr along a position angle of 136°. The stellar classification of the visible component is K2+ IIIb, which matches an evolved K-type giant star. It is a red clump star, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The interferometry-measured angular diameter of the primary, after correcting for limb darkening, is 1.96±0.03 mas, which, at its estimated distance, equates to a physical radius of about 10.6 times the radius of the Sun. It is radiating 42 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,490 K. The system is a likely (99.4% chance) source of the X-ray emission coming from these coordinates. (en)
  • HD 81799 är en misstänkt astrometrisk dubbelstjärna belägen i den södra delen av stjärnbilden Vattenormen som också har Bayer-beteckningen G Hydrae. Den har en kombinerad skenbar magnitud av ca 4,69 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 19,9 mas, beräknas den befinna sig på ett avstånd på ca 164 ljusår (ca 50 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 29 km/s. Den har en relativt stor egenrörelse och rör sig över himlavalvet med en vinkelhastighet av 233 ± 19 bågsekunder per år vid en positionsvinkel av 136°. (sv)
  • HD 81799 (G Hydrae) é uma estrela na direção da Hydra. Possui uma ascensão reta de 09h 27m 18.30s e uma declinação de −22° 20′ 36.3″. Sua magnitude aparente é igual a 4.72. Considerando sua distância de 176 anos-luz em relação à Terra, sua magnitude absoluta é igual a 1.06. Pertence à classe espectral K1III. (pt)
  • HD 81799,又名BD-21 2802,SAO 177469、HR 3749,是一颗恒星,视星等为4.69,位于銀經252.94,銀緯20.14,其B1900.0坐标为赤經9h 22m 43.7s,赤緯-21° 20.14′ 18″。 (zh)
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  • 1.320000 (xsd:double)
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  • 4.690000 (xsd:double)
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  • 1.154000 (xsd:double)
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  • K2+ IIIb (en)
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dbp:epoch
  • J2000 (en)
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  • 2.430000 (xsd:double)
dbp:luminosity
  • 41.970000 (xsd:double)
dbp:metalFe
  • −0.01 (en)
dbp:pError
  • 0.312800 (xsd:double)
dbp:parallax
  • 19.888700 (xsd:double)
dbp:propMoDec
  • −173.131 (en)
dbp:propMoRa
  • +160.160 (en)
dbp:radius
  • 10.600000 (xsd:double)
dbp:temperature
  • 4490 (xsd:integer)
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rdfs:comment
  • HD 81799 är en misstänkt astrometrisk dubbelstjärna belägen i den södra delen av stjärnbilden Vattenormen som också har Bayer-beteckningen G Hydrae. Den har en kombinerad skenbar magnitud av ca 4,69 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 19,9 mas, beräknas den befinna sig på ett avstånd på ca 164 ljusår (ca 50 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 29 km/s. Den har en relativt stor egenrörelse och rör sig över himlavalvet med en vinkelhastighet av 233 ± 19 bågsekunder per år vid en positionsvinkel av 136°. (sv)
  • HD 81799 (G Hydrae) é uma estrela na direção da Hydra. Possui uma ascensão reta de 09h 27m 18.30s e uma declinação de −22° 20′ 36.3″. Sua magnitude aparente é igual a 4.72. Considerando sua distância de 176 anos-luz em relação à Terra, sua magnitude absoluta é igual a 1.06. Pertence à classe espectral K1III. (pt)
  • HD 81799,又名BD-21 2802,SAO 177469、HR 3749,是一颗恒星,视星等为4.69,位于銀經252.94,銀緯20.14,其B1900.0坐标为赤經9h 22m 43.7s,赤緯-21° 20.14′ 18″。 (zh)
  • HD 81799 (G Hydrae) is a suspected astrometric binary star system in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.69. The distance to this system, as determined from an annual parallax shift of 19.9 mas, is 164 light years. It is moving further away from the Earth with a heliocentric radial velocity of 29 km/s. The system has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 233±19 mas/yr along a position angle of 136°. (en)
rdfs:label
  • HD 81799 (en)
  • HD 81799 (pt)
  • HD 81799 (sv)
  • HD 81799 (zh)
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foaf:name
  • HD 81799 (en)
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