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TW Horologii is a carbon star and semiregular variable in the southern constellation of Horologium, near the eastern constellation border with Reticulum. It has a ruddy hue and, with an apparent visual magnitude that ranges from 5.52 down to 5.95, is visible to the naked eye and one of the brightest carbon stars. Based on parallax measurements, it is located at a distance of approximately 1,370 light years from the Sun. It is drifting further away with a radial velocity of +14 km/s. In the past this star has been considered a member of the open cluster , but this now seems unlikely.

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  • TW Horologii (es)
  • TW Horologii (en)
  • 時鐘座TW (zh)
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  • 時鐘座TW,又名CP-57 513,HD 20234、SAO 233037、HR 977,是時鐘座的一颗恒星,视星等为5.74,位于銀經273.3,銀緯-50.9,其B1900.0坐标为赤經3h 10m 1.1s,赤緯-57° -50.9′ 45″。 (zh)
  • TW Horologii (TW Hor / HD 20234 / HR 977)​ es una estrella variable en la constelación austral de Horologium, el reloj. Situada a 1330 años luz de distancia del Sistema Solar, probablemente es miembro del cúmulo abierto , cuya edad es de unos 500 millones de años.​ (es)
  • TW Horologii is a carbon star and semiregular variable in the southern constellation of Horologium, near the eastern constellation border with Reticulum. It has a ruddy hue and, with an apparent visual magnitude that ranges from 5.52 down to 5.95, is visible to the naked eye and one of the brightest carbon stars. Based on parallax measurements, it is located at a distance of approximately 1,370 light years from the Sun. It is drifting further away with a radial velocity of +14 km/s. In the past this star has been considered a member of the open cluster , but this now seems unlikely. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/TWHorLightCurve.png
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absmag v
  • −1.79 (en)
appmag v
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  • C-N4IIIb: (en)
constell
epoch
  • J2000 (en)
gravity
p error
parallax
prop mo dec
  • +13.298 (en)
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