26 relations: Apparent magnitude, Astronomical unit, Bright Star Catalogue, Carina (constellation), Catalogues of Fundamental Stars, Cepheid variable, Constellation, Durchmusterung, Earth, Epoch (astronomy), Henry Draper Catalogue, Hipparcos, Interferometry, IRAS, Main sequence, Monthly Notices of the Royal Astronomical Society, Parallax, Radial velocity, Smithsonian Astrophysical Observatory Star Catalog, Spectrum, Star, Stellar classification, Stellar evolution, Supergiant, Variable star, 2MASS.
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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The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun.
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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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Carina is a constellation in the southern sky.
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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.
A Cepheid variable is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.
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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, 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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Earth (also the world, in Greek: Gaia, or in Latin: Terra), is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life.
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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 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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Interferometry is a family of techniques in which waves, usually electromagnetic, are superimposed in order to extract information about the waves.
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The Infrared Astronomical Satellite (IRAS) was the first-ever space-based observatory to perform a survey of the entire sky at infrared wavelengths.
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In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness.
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Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
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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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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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
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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A star is a luminous sphere of plasma held together by its own gravity.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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Stellar evolution is the process by which a star changes during its lifetime.
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Supergiants are among the most massive and most luminous stars.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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The Two Micron All-Sky Survey (2MASS) was a survey of the whole sky in three infrared wavebands around 2 micrometres (μm): J (1.25 μm), H (1.65 μm), and Ks (2.17 μm).
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