22 relations: Apparent magnitude, Aquila (constellation), Bayer designation, Binary star, Bright Star Catalogue, Celestial equator, Constellation, Doppler effect, Durchmusterung, Extinction (astronomy), Flamsteed designation, Giant star, Henry Draper Catalogue, Hipparcos, Interstellar medium, Margin of error, Minute and second of arc, Orbital period, Parallax, Smithsonian Astrophysical Observatory Star Catalog, Spectrum, Stellar classification.
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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Aquila is a constellation in the northern sky.
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 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 celestial equator is a great circle on the imaginary celestial sphere, in the same plane as the Earth's equator.
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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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The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source.
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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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Extinction is a term used in astronomy to describe the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.
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A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
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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.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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In astronomy, the interstellar medium (ISM) is the matter that exists in the space between the star systems in a galaxy.
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The margin of error is a statistic expressing the amount of random sampling error in a survey's results.
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A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree.
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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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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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.