25 relations: Am star, Apparent magnitude, Aquarius (constellation), Arabic, Bayer designation, Binary star, Catalogues of Fundamental Stars, Celestial equator, Chinese language, Constellation, Epsilon Aquarii, Girl (Chinese constellation), Henry Draper Catalogue, Hipparcos, Monthly Notices of the Royal Astronomical Society, Nu Aquarii, Orbital eccentricity, Orbital period, Parallax, Peculiar star, Spectrum, Stellar classification, 3 Aquarii, 4 Aquarii, 5 Aquarii.
An Am star or metallic-line star is a type of chemically peculiar star of spectral type A whose spectrum has strong and often variable absorption lines of metals such as zinc, strontium, zirconium, and barium, and deficiencies of others, such as calcium and scandium.
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The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
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Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces.
Arabic (العَرَبِية, or عربي,عربى) is the Classical Arabic language of the 6th century and its modern descendants excluding Maltese.
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A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
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A binary star is a star system consisting of two stars orbiting around their common center of mass.
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The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.
The celestial equator is a great circle on the imaginary celestial sphere, in the same plane as the Earth's equator.
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Chinese (汉语 / 漢語; Hànyǔ or 中文; Zhōngwén) is a group of related but in many cases mutually unintelligible language varieties, forming a branch of the Sino-Tibetan language family.
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In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
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Epsilon Aquarii (ε Aqr, ε Aquarii) is the Bayer designation for a star in the equatorial zodiac constellation of Aquarius.
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The Girl mansion (女宿, pinyin: Nǚ Xiù) is one of the Twenty-eight mansions of the Chinese constellations.
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
Nu Aquarii (ν Aqr, ν Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius.
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The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
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The orbital period is the time taken for a given object to make one complete orbit around another object.
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Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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In astrophysics, peculiar stars have distinctly unusual metal abundances, at least in their surface layers.
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A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary infinitely within a continuum.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
3 Aquarii is the Flamsteed designation for a variable star in the equatorial constellation of Aquarius.
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4 Aquarii is a binary star in the constellation Aquarius.
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5 Aquarii is a star in the constellation Aquarius.
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