12 relations: Apparent magnitude, Astronomical unit, Binary star, Constellation, Hipparcos, Julian day, Lacerta, Radial velocity, Slow irregular variable, Spectral line, Stellar classification, Variable star designation.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
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A binary star is a star system consisting of two stars orbiting around their common barycenter.
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A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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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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Julian day is the continuous count of days since the beginning of the Julian Period and is used primarily by astronomers.
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Lacerta is one of the 88 modern constellations defined by the International Astronomical Union.
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The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point.
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A slow irregular variable (ascribed the GCVS types L, LB and LC) is a variable star that exhibit no or very poorly defined periodicity in their slowly changing light emissions.
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.