48 relations: American Association of Variable Star Observers, Apparent magnitude, Astronomical spectroscopy, Astronomische Gesellschaft Katalog, B-type main-sequence star, Bayer designation, Binary star, Blueshift, Boss General Catalogue, Bright Star Catalogue, Catalogue of rotational velocities of the stars, Constellation, Cygnus (constellation), Durchmusterung, Flamsteed designation, General Catalogue of Stellar Radial Velocities, Gravitational energy, Guide Star Catalog, H-alpha, Henry Draper Catalogue, Hipparcos, Hypergiant, Johann Bayer, JP11, Light-year, Luminous blue variable, Mass transfer, Milky Way, Nova, Orbit, Orbital eccentricity, Parsec, PPM Star Catalogue, RAFGL, Redshift, Smithsonian Astrophysical Observatory Star Catalog, SN 2006gy, Solar mass, Spectral line, Star catalogue, Stellar classification, Stellar wind, Supernova, TD1 Catalog of Stellar Ultraviolet Fluxes, Uranometria, Variable star, Willem Blaeu, 2MASS.
Since its founding in 1911, the American Association of Variable Star Observers (AAVSO) has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and educators.
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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Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects.
The Astronomische Gesellschaft Katalog (AGK) is an astrometric star catalogue.
A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. B-type stars are extremely luminous and blue.
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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A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift.
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Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.
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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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Catalogue of rotational velocities of the stars is the name for catalogue of projected stellar rotation, publushed in 1982 by Uesugi, A. and Fukuda, I.
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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Cygnus is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan.
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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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Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.
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The General Catalogue of Stellar Radial Velocities is a star catalogue which lists radial velocities for 15,107 stars.
Gravitational energy is potential energy associated with the gravitational field.
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The Guide Star Catalog (GSC) is also known as the Hubble Space Telescope, Guide Catalog (HSTGC).
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H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series created by hydrogen with a wavelength of 656.28 nm, which occurs when a hydrogen electron falls from its third to second lowest energy level.
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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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A hypergiant (luminosity class 0 or Ia+) is a star with an enormous luminosity showing signs of a very high rate of mass loss.
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Johann Bayer (1572 – 7 March 1625) was a German lawyer and uranographer (celestial cartographer).
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JP11 is a star catalog containing about 4000 objects.
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A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.
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Luminous blue variables (LBVs) are massive evolved stars that show unpredictable and sometimes dramatic variations in both their spectra and their brightness.
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Mass transfer is the net movement of mass from one location, usually meaning a stream, phase, fraction or component, to another.
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The Milky Way is the galaxy that contains our Solar System.
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A nova (plural novae or novas) is a cataclysmic nuclear explosion on a white dwarf, which causes a sudden brightening of the star.
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In physics, an orbit is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center of a star system, such as the Solar System.
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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.
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A parsec (symbol: pc) is a unit of length used to measure the astronomically large distances to objects outside the Solar System.
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The PPM Star Catalogue (Positions and Proper Motions Star Catalogue) is the successor of the SAO Catalogue.
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RAFGL, the "Revised Air Force Geophysical Laboratory" (S.D. Price and T.L. Murdock, 1983), is a four-color infrared sky survey catalog.
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In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
SN 2006gy was an extremely energetic supernova, sometimes referred to as a hypernova or quark-nova, that was discovered on September 18, 2006.
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The solar mass is a standard unit of mass in astronomy that is used to indicate the masses of other stars, as well as clusters, nebulae and galaxies.
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A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
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A star catalogue, or star catalog, is an astronomical catalogue that lists stars.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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A stellar wind is a flow of gas ejected from the upper atmosphere of a star.
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A supernova is a stellar explosion that briefly outshines an entire galaxy, radiating as much energy as the Sun or any ordinary star is expected to emit over its entire life span, before fading from view over several weeks or months.
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In 1978, the TD1 Stellar Ultraviolet Flux Survey cataloged the ultraviolet flux of unreddened stars down to the 10th visual magnitude.
Uranometria is the short title of a star atlas produced by Johann Bayer.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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Willem Janszoon Blaeu (157121 October 1638), also abbreviated to Willem Jansz.
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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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