Английская Википедия:84 Ceti
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84 Ceti is the Flamsteed designation for a binary star system[1] in the equatorial constellation of Cetus. It has an apparent visual magnitude of 5.7,[2] making it faintly visible to the naked eye from dark suburban skies. Parallax measurements with the Hipparcos spacecraft put this system at a distance of around 74 light years.[3]
The primary, 84 Ceti A, is an F-type main sequence star with a stellar classification of F7V. It is slightly larger than the Sun, with 117% of the Sun's mass, 121% of the radius, and 213% of the luminosity.[4] The abundance of elements more massive than helium is 71% of the Sun's and it has a relatively high projected rotational velocity of 32 km/s.[5] This star is estimated to be less than half the age of the Sun, at 2.1 billion years.[4]
The secondary component, 84 Ceti B, has a classification of K2V,[1] making it a K-type main sequence star. It lies at an angular separation of 3.3″ from the primary, which is equivalent to a physical separation of at least 74.5 AU.[1]
The space velocity components of this system are: –13(U), –25(V), –2(W) km/s.[6] Based upon the position and motion, it is a candidate member of the Tucana-Horologium Association; this is a group of stars that share a similar motion through space and hence may have originated in the same molecular cloud.[7] 84 Ceti is following an orbit through the Milky Way galaxy that has an eccentricity of 0.03, taking it as close as Шаблон:Convert and as far as Шаблон:Convert from the Galactic Center. The inclination of the orbital plane carries it as far as Шаблон:Convert away from the galactic plane.[6]
References
- ↑ 1,0 1,1 1,2 Ошибка цитирования Неверный тег
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; для сносокRaghavan2010
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; для сносокRakos1982
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; для сносокAAA474_2_653
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; для сносокBoyajian2013
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; для сносокSchroder2009
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; для сносокHolmberg2009
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; для сносокNakajima2012
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- Английская Википедия
- Cetus
- Flamsteed objects
- F-type main-sequence stars
- K-type main-sequence stars
- Binary stars
- Durchmusterung objects
- Hipparcos objects
- Bright Star Catalogue objects
- Henry Draper Catalogue objects
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