52 relations: Algol variable, Alpha Cygni variable, Apparent magnitude, Asterism (astronomy), Astronomical unit, Bayer designation, Boss General Catalogue, Bright Star Catalogue, Catalog of Components of Double and Multiple Stars, Catalogues of Fundamental Stars, Chinese language, Constellation, Coptic language, Dipper (Chinese constellation), Double star, Dover Publications, Durchmusterung, Epoch (astronomy), Flamsteed designation, Giant star, Gravitational binding energy, Henry Draper Catalogue, Hipparcos, IAU Working Group on Star Names, Index Catalogue of Visual Double Stars, International Astronomical Union, Kelvin, Lambda Sagittarii, Latinisation of names, Light-year, Minute and second of arc, Occultation, Orbital period, Phi Sagittarii, PPM Star Catalogue, Reprint, Sagittarius (constellation), Sigma Sagittarii, Smithsonian Astrophysical Observatory Star Catalog, Solar luminosity, Solar mass, Solar radius, Star Names, Star system, Stellar association, Sun, Supergiant star, Tau Sagittarii, Variable star, Washington Double Star Catalog, ..., Zeta Sagittarii, 2MASS. Expand index (2 more) » « Shrink index
Algol variables or Algol-type binaries are a class of eclipsing binary stars that are related to the prototype member of this class, β Persei (Beta Persei, Algol) from an evolutionary point of view.
Alpha Cygni variables are variable stars which exhibit non-radial pulsations, meaning that some portions of the stellar surface are contracting at the same time others parts expand.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
In observational astronomy, an asterism is a popular known pattern or group of stars that are recognised in the night sky.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
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.
Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.
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.
The Catalog of Components of Double and Multiple Stars, or CCDM, is an astrometric star catalogue of double and multiple stars.
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.
Chinese is a group of related, but in many cases mutually unintelligible, language varieties, forming a branch of the Sino-Tibetan language family.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
Coptic or Coptic Egyptian (Bohairic: ti.met.rem.ən.khēmi and Sahidic: t.mənt.rəm.ən.kēme) is the latest stage of the Egyptian language, a northern Afro-Asiatic language spoken in Egypt until at least the 17th century.
The Dipper mansion (斗宿, pinyin: Dǒu Xiù) is one of the Twenty-eight mansions of the Chinese constellations.
In observational astronomy, a double star or visual double is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope.
Dover Publications, also known as Dover Books, is an American book publisher founded in 1941 by Hayward Cirker and his wife, Blanche.
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.
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.
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
A gravitational binding energy is the minimum energy that must be added to a system for the system to cease being in a gravitationally bound state.
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.
The International Astronomical Union (IAU) established a Working Group on Star Names (WGSN) in May 2016 to catalog and standardize proper names for stars for the international astronomical community.
The Index Catalogue of Visual Double Stars, or IDS, is a catalog of double stars.
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
Lambda Sagittarii (λ Sagittarii, abbreviated Lambda Sgr, λ Sgr), also named Kaus Borealis, is a star within the southern constellation of Sagittarius.
Latinisation or Latinization is the practice of rendering a non-Latin name (or word) in a Latin style.
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
An occultation is an event that occurs when one object is hidden by another object that passes between it and the observer.
The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
Phi Sagittarii (Phi Sgr, φ Sagittarii, φ Sgr) is a star in the southern constellation of Sagittarius.
The PPM Star Catalogue (Positions and Proper Motions Star Catalogue) is the successor of the SAO Catalogue.
A reprint is a re-publication of material that has already been previously published.
Sagittarius is one of the constellations of the zodiac.
Sigma Sagittarii (σ Sagittarii, abbreviated Sigma Sgr, σ Sgr), also named Nunki, is the second-brightest star in the constellation of Sagittarius.
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
The solar luminosity,, is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
Solar radius is a unit of distance used to express the size of stars in astronomy.
Star Names: Their Lore and Meaning is an 1899 book by Richard Hinckley Allen that discusses the names of stars, constellations, and their histories.
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
A stellar association is a very loose star cluster, looser than both open clusters and globular clusters.
The Sun is the star at the center of the Solar System.
Supergiants are among the most massive and most luminous stars.
Tau Sagittarii (Tau Sgr, τ Sagittarii, τ Sgr) is a star in the southern zodiac constellation of Sagittarius.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
The Washington Double Star Catalog, or WDS, is a catalog of double stars, maintained at the United States Naval Observatory.
Zeta Sagittarii (ζ Sagittarii, abbreviated Zeta Sgr, ζ Sgr) is a triple star system and the third-brightest star in the constellation of Sagittarius.
The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.