21 Arietis
21 Arietis (abbreviated 21 Ari) is a binary star system in the northern constellation of Aries. 21 Arietis is the Flamsteed designation. It has a combined apparent visual magnitude is 5.57; the brighter member is magnitude 6.40 while the fainter star is magnitude 6.48. The distance to this star system, based upon an annual parallax shift of 19.58 mas, is 167 light-years (51 parsecs). The pair orbit each other with a period of 23.70 years and an eccentricity of 0.68.
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21 Arietis
21 Arietis (abbreviated 21 Ari) is a binary star system in the northern constellation of Aries. 21 Arietis is the Flamsteed designation. It has a combined apparent visual magnitude is 5.57; the brighter member is magnitude 6.40 while the fainter star is magnitude 6.48. The distance to this star system, based upon an annual parallax shift of 19.58 mas, is 167 light-years (51 parsecs). The pair orbit each other with a period of 23.70 years and an eccentricity of 0.68.
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21 Arietis (abbreviated 21 Ari ...... s and an eccentricity of 0.68.
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21 Arietis è una stella stella ...... anni luce dal sistema solare.
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白羊座21（21 Ari, 21 Arietis），是一个位于白羊座的联星系统，距离地球约157光年，视星等为5.57。
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21 Arietis (abbreviated 21 Ari ...... s and an eccentricity of 0.68.
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21 Arietis è una stella stella ...... anni luce dal sistema solare.
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白羊座21（21 Ari, 21 Arietis），是一个位于白羊座的联星系统，距离地球约157光年，视星等为5.57。
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21 Arietis
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21 Arietis
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白羊座21
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21 Arietis
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