Zeta Boötis (ζ Boo / ζ Boötis) is a bright speckle binary in the constellation of Boötes. It also has the Flamsteed designation 30 Boötis. It is approximately 181 light years from Earth and has a combined apparent magnitude of +3.78. The angular separation of the components is currently about 0.8" (this varies slightly with orbital period).
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- Zeta Boötis (ζ Boo / ζ Boötis) is a bright speckle binary in the constellation of Boötes. It also has the Flamsteed designation 30 Boötis. It is approximately 181 light years from Earth and has a combined apparent magnitude of +3.78. The angular separation of the components is currently about 0.8" (this varies slightly with orbital period). As the separation is close to the seeing limit of most astronomical observations, ζ Boötis is often used to test the performance of new high resolution imaging techniques. Both components, are white A-type giants with apparent magnitudes of +4.43 and +4.83. Image:zboo lucky image 1pc. png|Zeta Bootis imaged with the Nordic Optical Telescope on 13 May 2000 using the lucky imaging method. (The Airy discs around the stars is diffraction from the 2.56m telescope aperture. ) Image:Zeta bootis short exposure. png|Typical short-exposure image of a binary star, as seen using speckle imaging through the Earth's atmosphere.
- Zeta Bootis (ζ Boo / 30 Bootis) es una estrella binaria de magnitud aparente +3,78 en la constelación de Boötes, el pastor, cuyas componentes están separadas actualmente algo menos de 1 segundo de arco. Se encuentra a 180 años luz de distancia del Sistema Solar. Las dos componentes del sistema son dos estrellas blancas de tipo espectral A2 o A3 clasificadas como gigantes o subgigantes,aunque la relación entre luminosidad y temperatura parece indicar que son estrellas de la secuencia principal. Las dos estrellas son muy similares: de brillo casi idéntico (magnitudes +4,52 y +4,55), su temperatura superficial es de 8750 K y la luminosidad de cada una de ellas es 38 veces mayor que la del Sol. La separación media entre las dos estrellas es 33 UA con un período orbital de 123 años. La órbita tiene una excentricidad muy alta, una de las mayores que se conocen, lo que hace que la distancia entre las componentes varíe entre 1,4 y 64 UA. Cuando la distancia es máxima las estrellas se pueden separar con telescopio, mientras que con mímina separación (acaecida en 1897 y que vuelve a tener lugar en 2021) no se pueden resolver.
- 牧夫座ζ(ζ Boo、ζ Boötis或左攝提三)是一個位于牧夫座的亮雙星系統。其依照佛氏命名法也稱爲牧夫座30(30 Boötis)。牧夫座ζ大約距離地球181光年,其組成的兩顆星結合的視星等為+3.78。 目前,牧夫座ζ的兩顆星之間的角度距離為0.8"(此數字在兩顆恆星互相公轉時會有所變動),因此牧夫座ζ常被用作測試新的高精度拍攝技術。 其組成的兩顆恆星都是白色的A型巨星,視星等分別為+4.43和+4.83。 牧夫座ζ被認爲屬於大熊座移動星群。 File:zboo lucky image 1pc. png|Zeta Bootis imaged with the Nordic Optical Telescope on 13 May 2000 using the lucky imaging method. (The Airy discs around the stars is diffraction from the 2.56m telescope aperture. ) File:Zeta bootis short exposure. png|Typical short-exposure image of a binary star, as seen using speckle imaging through the Earth's atmosphere.
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- Zeta Boötis (ζ Boo / ζ Boötis) is a bright speckle binary in the constellation of Boötes. It also has the Flamsteed designation 30 Boötis. It is approximately 181 light years from Earth and has a combined apparent magnitude of +3.78. The angular separation of the components is currently about 0.8" (this varies slightly with orbital period).
- Zeta Bootis (ζ Boo / 30 Bootis) es una estrella binaria de magnitud aparente +3,78 en la constelación de Boötes, el pastor, cuyas componentes están separadas actualmente algo menos de 1 segundo de arco. Se encuentra a 180 años luz de distancia del Sistema Solar.
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- Zeta Boötis
- Zeta Bootis
- 牧夫座ζ
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