26 relations: Am star, Apparent magnitude, Bayer designation, Binary star, Boss General Catalogue, Bright Star Catalogue, Catalogues of Fundamental Stars, Centre de données astronomiques de Strasbourg, Constellation, Durchmusterung, Epoch (astronomy), Flamsteed designation, Henry Draper Catalogue, Hipparcos, International Celestial Reference System, Light-year, Lupus (constellation), Mercury-manganese star, Parsec, PPM Star Catalogue, Proper motion, Scorpius–Centaurus Association, SIMBAD, Smithsonian Astrophysical Observatory Star Catalog, Star, Stellar kinematics.
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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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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Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.
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The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.
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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 Centre de données astronomiques de Strasbourg (CDS; English translation: Strasbourg Astronomical Data Center) is a data hub which collects and distributes astronomical information.
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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In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
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In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.
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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.
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Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.
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Lupus is a constellation located in the deep southern sky.
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A mercury-manganese star is a type of chemically peculiar star with a prominent spectral line at 398.4 nm, due to absorption from ionized mercury.
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A parsec (symbol: pc) is a unit of length used to measure the astronomically large distances to objects outside the Solar System.
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The PPM Star Catalogue (Positions and Proper Motions Star Catalogue) is the successor of the SAO Catalogue.
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Proper motion is the astronomical measure of the observed changes in apparent positions of stars in the sky as seen from the center of mass of the Solar System, as compared to the imaginary fixed background of the more distant stars.
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The Scorpius–Centaurus Association (sometimes called Sco–Cen or Sco OB2) is the nearest OB association to the Sun.
SIMBAD (the Set of Identifications, Measurements, and Bibliography for Astronomical Data) is an astronomical database of objects beyond the Solar System.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
A star is a luminous sphere of plasma held together by its own gravity.
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Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion.
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