62 relations: Abd al-Rahman al-Sufi, Algol, American Association of Variable Star Observers, Ancient Greece, Apparent magnitude, Astronomical unit, Astronomy Picture of the Day, Asymptotic giant branch, Babylon, Binary star, Bow shocks in astrophysics, Bright Star Catalogue, California Institute of Technology, Cetus, Chandra X-ray Observatory, Chinese constellations, Constellation, David Fabricius, Durchmusterung, Epoch (astronomy), GALEX, General Catalogue of Variable Stars, Henry Draper Catalogue, Hipparchus, Hipparcos, History of China, Hubble Space Telescope, Infrared, Interstellar medium, Ismaël Bullialdus, Johannes Hevelius, Johannes Phocylides Holwarda, Jupiter, Karl Manitius, Light curve, Light-year, List of stars in Cetus, Main sequence, Margin of error, Mercury (planet), Mira B, Mira variable, NASA, Orbital period, Planetary nebula, Protoplanetary disk, Ptolemy, Red giant, Smithsonian Astrophysical Observatory, Solar irradiance, ..., Solar mass, Star, Star catalogue, Stellar classification, Stellar wind, Sun, Supernova, Tycho Brahe, Ultraviolet, Ulugh Beg, Variable star, White dwarf. Expand index (12 more) » « Shrink index
'Abd al-Rahman al-Sufi (عبدالرحمن صوفی) (December 9, 903 in Rey, Iran – May 25, 986 in Shiraz, Iran) was a Persian astronomer also known as 'Abd ar-Rahman as-Sufi, or 'Abd al-Rahman Abu al-Husayn, 'Abdul Rahman Sufi, 'Abdurrahman Sufi and known in the west as Azophi.
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Algol (Beta Per, β Persei, β Per), known colloquially as the Demon Star, is a bright star in the constellation Perseus.
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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.
Ancient Greece was a civilization belonging to a period of Greek history that lasted from the Archaic period of the 8th to 6th centuries BC to the end of antiquity (circa 600 AD).
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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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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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Astronomy Picture of the Day (APOD) is a website provided by NASA and Michigan Technological University (MTU).
The asymptotic giant branch is the region of the Hertzsprung–Russell diagram populated by evolving low- to medium-mass stars.
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Babylon (Bābili or Babilim; بابل, Bābil) was a significant city in ancient Mesopotamia, in the fertile plain between the Tigris and Euphrates rivers.
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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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Bow shocks form the boundary between a magnetosphere and an ambient magnetized medium.
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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 California Institute of Technology or CaltechThe university itself only spells its short form as "Caltech"; other spellings such as.
Cetus is a constellation.
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The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a space observatory launched on STS-93 by NASA on July 23, 1999.
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Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese xīng guān).
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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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David Fabricius (March 9, 1564 – May 7, 1617), was a German pastor who made two major discoveries in the early days of telescopic astronomy, jointly with his eldest son, Johannes Fabricius (1587–1615).
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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.
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The Galaxy Evolution Explorer (GALEX) is an orbiting ultraviolet space telescope launched on April 28, 2003, and operated until early 2012.
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The General Catalogue of Variable Stars (GCVS) is a list of variable stars.
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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Hipparchus of Nicaea (Ἵππαρχος, Hipparkhos), was a Greek astronomer, geographer, and mathematician.
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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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Written records of the history of China can be found from as early as 1200 BC under the Shang dynasty (c. 1600–1046 BC).
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The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990, and remains in operation.
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Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz) (although people can see infrared up to at least 1050 nm in experiments).
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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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Ismaël Bullialdus (1605–1694) was a famous astronomer and mathematician during the seventeenth century.
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Johannes Hevelius Some sources refer to Hevelius as Polish.
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Johannes Phocylides Holwarda (Jan Fokkesz, Jan Fokker, Johann Holwarda, Johannes Fokkes Holwarda, Jan Fokkens Holwarda, Jan Fokkes van Holwerd) (February 19, 1618—January 22, 1651) was a Frisian astronomer, physician, and philosopher.
Jupiter is the fifth planet from the Sun and the largest planet in the Solar System.
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Karl Manitius (23 July 1899 – 26 December 1979) was a German historian.
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In astronomy, a light curve is a graph of light intensity of a celestial object or region, as a function of time.
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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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This is the list of notable stars in the constellation Cetus, sorted by decreasing brightness.
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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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The margin of error is a statistic expressing the amount of random sampling error in a survey's results.
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Mercury is the smallest and closest to the Sun of the eight planets in the Solar System, with an orbital period of about 88 Earth days.
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Mira B, also known as VZ Ceti, is the companion star to the variable star Mira.
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Mira variables, named after the prototype star Mira, are a class of pulsating variable stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
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The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.
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The orbital period is the time taken for a given object to make one complete orbit around another object.
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A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives.
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A protoplanetary disk is a rotating circumstellar disk of dense gas surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star.
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Claudius Ptolemy (Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos,; Claudius Ptolemaeus) was a Greco-Egyptian writer of Alexandria, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.
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A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
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The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution headquartered in Cambridge, Massachusetts, where it is joined with the Harvard College Observatory (HCO) to form the Harvard–Smithsonian Center for Astrophysics (CfA).
Solar irradiance (also Insolation, from Latin insolare, to expose to the sun) is the power per unit area produced by the Sun in the form of electromagnetic radiation.
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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 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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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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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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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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Tycho Brahe, born Tyge Ottesen Brahe (14 December 154624 October 1601), was a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations.
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Ultraviolet (UV) light is an electromagnetic radiation with a wavelength from 400 nm to 100 nm, shorter than that of visible light but longer than X-rays.
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Mīrzā Muhammad Tāraghay bin Shāhrukh (میرزا محمد طارق بن شاہ رخ, میرزا محمد تراغای بن شاہ رخ) better known as Ulugh Beg (March 22, 1394 in Sultaniyeh, Persia – October 27, 1449, Samarkand) was a Timurid ruler as well as an astronomer, mathematician and sultan.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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A white dwarf, also called a degenerate dwarf, is a stellar remnant composed mostly of electron-degenerate matter.
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