11 relations: Apparent magnitude, Apus, Constellation, Epoch (astronomy), General Catalogue of Variable Stars, International Celestial Reference System, RV Tauri variable, SIMBAD, Star, Variable star, Variable star designation.
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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Apus is a faint constellation in the southern sky, first defined in the late 16th century.
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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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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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The General Catalogue of Variable Stars (GCVS) is a list of variable stars.
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
RV Tauri variables are luminous variable stars that have distinctive light variations with alternating deep and shallow minima.
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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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A star is a luminous sphere of plasma held together by its own gravity.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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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.