34 relations: Angular distance, Apparent magnitude, Aquarius (constellation), Astronomical unit, Binary star, Bortle scale, Bright Star Catalogue, Castor Moving Group, Celestial equator, Coeval, Constellation, Debris disk, Durchmusterung, Effective temperature, Flamsteed designation, G-type main-sequence star, Gliese Catalogue of Nearby Stars, Henry Draper Catalogue, Hipparcos, Infrared excess, Main sequence, Minute and second of arc, Monthly Notices of the Royal Astronomical Society, Parallax, Peculiar star, Position angle, Smithsonian Astrophysical Observatory Star Catalog, Solar analog, Spectrum, Spitzer Space Telescope, Star catalogue, Stellar atmosphere, Stellar classification, X-ray astronomy.
In mathematics (in particular geometry and trigonometry) and all natural sciences (including astronomy, geophysics, etc.), the angular distance (angular separation, apparent distance, or apparent separation) between two point objects, as observed from a location different from either of these objects, is the size of the angle between the two directions originating from the observer and pointing towards these two objects.
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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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Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces.
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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A binary star is a star system consisting of two stars orbiting around their common center of mass.
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The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location.
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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 Castor Moving Group is a moving group of stars sharing similar velocities.
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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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A debris disk is a circumstellar disk of dust and debris in orbit around a star.
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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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The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.
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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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A G-type main-sequence star (Spectral type: G-V), often (and imprecisely) called a yellow dwarf, or G dwarf star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.8 to 1.2 solar masses and surface temperature of between 5,300 and 6,000 K., G. M. H. J. Habets and J. R. W. Heintze, Astronomy and Astrophysics Supplement 46 (November 1981), pp.
The Gliese Catalogue of Nearby Stars is a modern star catalogue of stars located within 25 parsecs (81.54 ly) of the Earth.
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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An infrared excess is a measurement of an astronomical source, typically a star, that in their spectral energy distribution has a greater measured infrared flux than expected by assuming the star is a blackbody radiator.
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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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A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree.
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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In astrophysics, peculiar stars have distinctly unusual metal abundances, at least in their surface layers.
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Position angle, usually abbreviated PA, is a measurement relating to observed visual binary stars.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
Solar-type star, solar analogs, and solar twins are stars that are particularly similar to the Sun.
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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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The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003.
A star catalogue, or star catalog, is an astronomical catalogue that lists stars.
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The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray observation and detection from astronomical objects.
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