41 relations: Adaptive optics, Apparent magnitude, Astronomical unit, Beta Trianguli, Binary star, Bond (Chinese constellation), Bright Star Catalogue, Center of mass, Chi Andromedae, Chinese language, Constellation, Day, Durchmusterung, Epoch (astronomy), Flamsteed designation, G-type main-sequence star, Gamma Andromedae, Gamma Trianguli, Gliese Catalogue of Nearby Stars, Henry Draper Catalogue, Hipparcos, Infrared excess, K-type main-sequence star, Main sequence, Monthly Notices of the Royal Astronomical Society, Orbital eccentricity, Phi Persei, Smithsonian Astrophysical Observatory Star Catalog, Star, Star catalogue, Star system, Stellar classification, Sun, Tau Andromedae, Triangulum, Upsilon Andromedae, V4046 Sagittarii, Very Large Telescope, 49 Andromedae, 51 Andromedae, 56 Andromedae.
Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effect of wavefront distortions: it aims at correcting the deformations of an incoming wavefront by deforming a mirror in order to compensate for the distortion.
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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.
The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun.
Beta Trianguli (Beta Tri, β Trianguli, β Tri) is the Bayer designation for a binary star system in the constellation Triangulum, located about 127 light years from Earth.
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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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Leu (or Low) sieu meaning "the Train of a garment", was one of the twenty-eight lunar mansions of the traditional Chinese astronomy.
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.
In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero or the point where if a force is applied causes it to move in direction of force without rotation.
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Chi Andromedae (χ Andromedae, χ And) is the Bayer designation for a star in the northern constellation of Andromeda.
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Chinese (汉语 / 漢語; Hànyǔ or 中文; Zhōngwén) is a group of related but in many cases mutually unintelligible language varieties, forming a branch of the Sino-Tibetan language family.
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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 day is a unit of time.
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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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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.
Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.
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.
Gamma Andromedae (Gamma And, γ And, γ Andromedae) is the third brightest point of light in the constellation of Andromeda.
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Gamma Trianguli (Gamma Tri, γ Trianguli, γ Tri) is a star in the constellation Triangulum located approximately 112 light years from Earth.
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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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A K-type main-sequence star (K V), also referred to as an orange dwarf or K dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars and yellow G-type main-sequence stars.
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.
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
Phi Persei (Phi Per, φ Persei, φ Per) is a Class B2Vpe, fourth-magnitude star in the constellation Perseus.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
A star is a luminous sphere of plasma held together by its own gravity.
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A star catalogue, or star catalog, is an astronomical catalogue that lists stars.
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A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.
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Tau Andromedae (τ And, τ Andromedae) is the Bayer designation for a star in the northern constellation of Andromeda.
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Triangulum is a small constellation in the northern sky.
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Upsilon Andromedae (υ Andromedae, υ And) is a binary star located approximately 44 light-years from Earth in the constellation Andromeda.
V4046 Sagittarii is young T Tauri binary consisting of two G V stars surrounded by a massive protoplanetary disk where gas giants are thought to have formed.
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The Very Large Telescope (VLT) is a telescope operated by the European Southern Observatory on Cerro Paranal in the Atacama Desert of northern Chile.
49 Andromedae is a star in the constellation Andromeda.
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51 Andromedae is a 4th magnitude star, the 5th brighest in the constellation Andromeda.
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56 Andromedae is a double star in the constellation Andromeda.
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