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天門二（室女座69，69 Virginis）是室女座的一颗恒星，距离地球约259光年 … 天門二（室女座69，69 Virginis）是室女座的一颗恒星，距离地球约259光年。它可以用肉眼看见，是微弱的橙色恒星，视星等 4.76，但它疑似是变星，视星等从4.75到4.79之间变化。天门二以 -13 km/s 的日心径向速度向地球靠近。由于宇宙尘埃，天门二发出的光受到偏振。 天门二是演化了的K型巨星，恒星分类为K0 III-IIIb CN1.5 CH0.5，显示其恒星光谱中有过多的CN和CH分子。它是一个紅群聚巨星，表明它在水平分支的核心通过氦聚变产生能量。天门二的年龄约2.88亿年，质量是太阳的3.5倍，半径是太阳的15倍。它从扩大的光球辐射出的光是太阳的87倍，有效温度 4,909 K。径是太阳的15倍。它从扩大的光球辐射出的光是太阳的87倍，有效温度 4,909 K。
, 69 Virginis is a single star in the zodiac … 69 Virginis is a single star in the zodiac constellation of Virgo, located about 259 light years away. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.76, although it is a suspected variable that may range in magnitude from 4.75 down to 4.79. This object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s. The light from this star is polarized due to intervening interstellar dust. This is an evolved K-type giant star with a stellar classification of K0 III-IIIb CN1.5 CH0.5, showing overabundances of CN and CH molecules in the spectrum. It is a red clump giant, which indicates is on the horizontal branch generating energy via helium fusion at its core. The star is about 288 million years old with 3.5 times the mass of the Sun and 15 times the Sun's radius. It is radiating 87 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,909 K.re at an effective temperature of 4,909 K.
, 69 Virginis, som är stjärnans Flamsteed-be … 69 Virginis, som är stjärnans Flamsteed-beteckning, är en ensam stjärna i den södra delen av stjärnbilden Jungfrun,. Den har en genomsnittlig skenbar magnitud på ca 4,76 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 12,6 mas, beräknas den befinna sig på ett avstånd på ca 259 ljusår (ca 79 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -13 km/s. Ljuset från stjärnan är polariserat på grund av mellanliggande interstellärt stoft.und av mellanliggande interstellärt stoft.
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天門二（室女座69，69 Virginis）是室女座的一颗恒星，距离地球约259光年 … 天門二（室女座69，69 Virginis）是室女座的一颗恒星，距离地球约259光年。它可以用肉眼看见，是微弱的橙色恒星，视星等 4.76，但它疑似是变星，视星等从4.75到4.79之间变化。天门二以 -13 km/s 的日心径向速度向地球靠近。由于宇宙尘埃，天门二发出的光受到偏振。 天门二是演化了的K型巨星，恒星分类为K0 III-IIIb CN1.5 CH0.5，显示其恒星光谱中有过多的CN和CH分子。它是一个紅群聚巨星，表明它在水平分支的核心通过氦聚变产生能量。天门二的年龄约2.88亿年，质量是太阳的3.5倍，半径是太阳的15倍。它从扩大的光球辐射出的光是太阳的87倍，有效温度 4,909 K。径是太阳的15倍。它从扩大的光球辐射出的光是太阳的87倍，有效温度 4,909 K。
, 69 Virginis, som är stjärnans Flamsteed-be … 69 Virginis, som är stjärnans Flamsteed-beteckning, är en ensam stjärna i den södra delen av stjärnbilden Jungfrun,. Den har en genomsnittlig skenbar magnitud på ca 4,76 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 12,6 mas, beräknas den befinna sig på ett avstånd på ca 259 ljusår (ca 79 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -13 km/s. Ljuset från stjärnan är polariserat på grund av mellanliggande interstellärt stoft.und av mellanliggande interstellärt stoft.
, 69 Virginis is a single star in the zodiac … 69 Virginis is a single star in the zodiac constellation of Virgo, located about 259 light years away. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.76, although it is a suspected variable that may range in magnitude from 4.75 down to 4.79. This object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s. The light from this star is polarized due to intervening interstellar dust.ized due to intervening interstellar dust.
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天門二
, 69 Virginis
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