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21 Sagittarii is a binary star system in the southern zodiac constellation of Sagittarius. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.81. The system is located approximately 410 light years away from the Sun based on parallax. It is moving closer to the Earth with a heliocentric radial velocity of −11.80 km/s.

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  • 21 Sagittarii (en)
  • 21 Sagittarii (sv)
  • 六分儀座21 (zh)
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  • 21 Sagittarii, som är stjärnans Flamsteed-beteckning, är en dubbelstjärna, belägen i den norra delen av stjärnbilden Skytten. Den har en kombinerad skenbar magnitud på 4,81 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 8,0 mas, beräknas den befinna sig på ett avstånd på ca 410 ljusår (ca 130 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -12 km/s. (sv)
  • 六分儀座21,又名BD-20 5134,HD 169420、SAO 186794、HR 6896,是六分儀座的一颗恒星,视星等为4.81,位于銀經11.74,銀緯-3.75,其B1900.0坐标为赤經18h 19m 23.6s,赤緯-20° -3.75′ 43″。 (zh)
  • 21 Sagittarii is a binary star system in the southern zodiac constellation of Sagittarius. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.81. The system is located approximately 410 light years away from the Sun based on parallax. It is moving closer to the Earth with a heliocentric radial velocity of −11.80 km/s. (en)
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  • 21 Sagittarii (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Red_circle.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Sagittarius_constellation_map.svg
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absmag v
  • −0.67 (en)
appmag v
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  • +1.30 (en)
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  • (en)
  • K2II + A5: (en)
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  • J2000 (en)
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