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61 Cygni

Index 61 Cygni

61 Cygni Not to be confused with 16 Cygni, a more distant system containing two G-type stars harboring the gas giant planet 16 Cygni Bb. [1]

121 relations: Alpha Centauri, Angular diameter, Angular distance, Angular resolution, Apparent magnitude, Apsis, Asteroseismology, Astronomical Society of the Pacific, Astronomical unit, Astronomy & Astrophysics, Barnard's Star, Barycenter, Bayer designation, Benjamin Boss, Bernhard von Lindenau, Beta Columbae, Billion years, Binary star, Binoculars, Bright Star Catalogue, Brown dwarf, BY Draconis variable, Côte d'Azur Observatory, Christian Heinrich Friedrich Peters, Chromosphere, Circumstellar habitable zone, Claude-Louis Mathieu, Common Era, Comoving and proper distances, Constellation, Cygnus (constellation), Debris disk, Delta Eridani, Deneb, Double star, Durchmusterung, Dwarf star, Earth, Epsilon Eridani, Exozodiacal dust, Flamsteed designation, Flare star, François Arago, Friedrich Bessel, Friedrich Georg Wilhelm von Struve, Friedrich Wilhelm Argelander, Gas giant, Giuseppe Piazzi, Gliese Catalogue of Nearby Stars, Groombridge 1830, ..., Hal Clement, Heliometer, Henry Draper Catalogue, Hipparcos, Infrared excess, James Bradley, John Flamsteed, Joseph von Fraunhofer, Jupiter, Jupiter mass, K-type main-sequence star, Kaj Aage Gunnar Strand, Kapteyn's Star, Königsberg, Light pollution, Light-year, List of Arabic star names, List of nearest stars and brown dwarfs, Main sequence, McDonald Observatory, Minute and second of arc, Mission of Gravity, Mu Cassiopeiae, Naked eye, NASA, Neptune, Orbital eccentricity, Orbital elements, Orbital period, Orion (constellation), Parallax, Peter van de Kamp, Pi Mensae, Planet, Procyon, Proper motion, Pulkovo Observatory, Radial velocity, Right ascension, Saint Petersburg, San Francisco State University, Saturn, Sirius, Smithsonian Astrophysical Observatory, Space Interferometry Mission, Sproul Observatory, Star catalogue, Star system, Stars and planetary systems in fiction, Stellar classification, Stellar kinematics, Stellar magnetic field, Stellar parallax, Stellar rotation, Sun, Sunspot, The Astronomical Journal, The Astrophysical Journal, Thick disk, Thomas Henderson (astronomer), Traditional Chinese star names, University of Illinois at Urbana–Champaign, Variable star, Variable star designation, Vega, W. M. Keck Observatory, William Herschel, Wulff-Dieter Heintz, Yerkes Observatory, 16 Cygni, 16 Cygni Bb. Expand index (71 more) »

Alpha Centauri

Alpha Centauri (α Centauri, abbreviated Alf Cen or α Cen) is the star system closest to the Solar System, being from the Sun.

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Angular diameter

The angular diameter, angular size, apparent diameter, or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view.

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Angular distance

In mathematics (in particular geometry and trigonometry) and all natural sciences (e.g. astronomy and geophysics), the angular distance (angular separation, apparent distance, or apparent separation) between two point objects, as viewed from a location different from either of these objects, is the angle of length between the two directions originating from the observer and pointing toward these two objects.

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Angular resolution

Angular resolution or spatial resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution.

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Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

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An apsis (ἁψίς; plural apsides, Greek: ἁψῖδες) is an extreme point in the orbit of an object.

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Asteroseismology or astroseismology is the study of oscillations in stars.

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Astronomical Society of the Pacific

The Astronomical Society of the Pacific (ASP) is an American scientific and educational organization, founded in San Francisco on February 7, 1889.

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Astronomical unit

The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.

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Astronomy & Astrophysics

Astronomy & Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.

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Barnard's Star

Barnard's Star is a very-low-mass red dwarf about 6 light-years away from Earth in the constellation of Ophiuchus.

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The barycenter (or barycentre; from the Ancient Greek βαρύς heavy + κέντρον centre) is the center of mass of two or more bodies that are orbiting each other, which is the point around which they both orbit.

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Bayer designation

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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Benjamin Boss

Benjamin Boss (January 9, 1880 – October 17, 1970) was an American astronomer.

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Bernhard von Lindenau

Baron Bernhard August von Lindenau (11 June 1780 – 21 May 1854) was a German lawyer, astronomer, politician, and art collector.

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Beta Columbae

Beta Columbae (β Columbae, abbreviated Beta Col, β Col), also named Wazn, is the second brightest star in the southern constellation of Columba.

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Billion years

A billion years (109 years) is a unit of time on the petasecond scale, more precisely equal to seconds.

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Binary star

A binary star is a star system consisting of two stars orbiting around their common barycenter.

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Binoculars or field glasses are two telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

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Bright Star Catalogue

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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Brown dwarf

Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars, having masses between approximately 13 to 75–80 times that of Jupiter, or approximately to about.

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BY Draconis variable

BY Draconis variables are variable stars of late spectral types, usually K or M, and typically belong to the main sequence.

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Côte d'Azur Observatory

The Côte d'Azur Observatory (Observatoire de la Côte d'Azur, OCA) originated in 1988 with the merger of two observatories.

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Christian Heinrich Friedrich Peters

Christian Heinrich Friedrich Peters (September 19, 1813 – July 18, 1890) was a German–American astronomer, and a pioneer in the study of asteroids.

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The chromosphere (literally, "sphere of color") is the second of the three main layers in the Sun's atmosphere and is roughly 3,000 to 5,000 kilometers deep.

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Circumstellar habitable zone

In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.

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Claude-Louis Mathieu

Claude-Louis Mathieu or Louis Mathieu (25 November 1783 in Mâcon – 5 March 1875 in Paris) was a French mathematician and astronomer who began his career as an engineer.

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Common Era

Common Era or Current Era (CE) is one of the notation systems for the world's most widely used calendar era – an alternative to the Dionysian AD and BC system.

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Comoving and proper distances

In standard cosmology, comoving distance and proper distance are two closely related distance measures used by cosmologists to define distances between objects.

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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.

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Cygnus (constellation)

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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Debris disk

A debris disk is a circumstellar disk of dust and debris in orbit around a star.

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Delta Eridani

Delta Eridani (δ Eri, δ Eridani) is a 3.54 magnitude star in the constellation of Eridanus.

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Deneb, also designated α Cygni (Latinised alpha Cygni, abbreviated Alpha Cyg, α Cyg), is the brightest star in the constellation of Cygnus.

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Double star

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.

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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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Dwarf star

A dwarf star is a star of relatively small size and low luminosity.

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Earth is the third planet from the Sun and the only astronomical object known to harbor life.

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Epsilon Eridani

Epsilon Eridani (ε Eridani, abbreviated Epsilon Eri, ε Eri), also named Ran, is a star in the southern constellation of Eridanus, at a declination of 9.46° south of the celestial equator.

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Exozodiacal dust

Exozodiacal dust is 1-100 micrometre-sized grains of amorphous carbon and silicate dust that fill the plane of extrasolar planetary systems.

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Flamsteed designation

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.

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Flare star

A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes.

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François Arago

Dominique François Jean Arago (Domènec Francesc Joan Aragó), known simply as François Arago (Catalan: Francesc Aragó) (26 February 17862 October 1853), was a French mathematician, physicist, astronomer, freemason, supporter of the carbonari and politician.

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Friedrich Bessel

Friedrich Wilhelm Bessel (22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist and geodesist.

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Friedrich Georg Wilhelm von Struve

Friedrich Georg Wilhelm von Struve (Василий Яковлевич Струве, trans. Vasily Yakovlevich Struve; 15 April 1793 –) was a German-Russian astronomer and geodesist from the famous Struve family.

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Friedrich Wilhelm Argelander

Friedrich Wilhelm August Argelander (22 March 1799 – 17 February 1875) was a German astronomer.

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Gas giant

A gas giant is a giant planet composed mainly of hydrogen and helium.

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Giuseppe Piazzi

Giuseppe Piazzi (16 July 1746 – 22 July 1826) was an Italian Catholic priest of the Theatine order, mathematician, and astronomer.

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Gliese Catalogue of Nearby Stars

The Gliese Catalogue of Nearby Stars is a modern star catalogue of stars located within 25 parsecs (81.54 ly) of the Earth.

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Groombridge 1830

Groombridge 1830 (also known as 1830 Groombridge or Argelander's Star) is a star in the constellation Ursa Major.

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Hal Clement

Harry Clement Stubbs (May 30, 1922 – October 29, 2003), better known by the pen name Hal Clement, was an American science fiction writer and a leader of the hard science fiction subgenre.

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A heliometer (from Greek ἥλιος hḗlios "sun" and measure) is an instrument originally designed for measuring the variation of the sun's diameter at different seasons of the year, but applied now to the modern form of the instrument which is capable of much wider use.

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Henry Draper Catalogue

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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Infrared excess

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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James Bradley

James Bradley FRS (March 1693 – 13 July 1762) was an English astronomer and priest and served as Astronomer Royal from 1742, succeeding Edmond Halley.

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John Flamsteed

John Flamsteed FRS (19 August 1646 – 31 December 1719) was an English astronomer and the first Astronomer Royal.

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Joseph von Fraunhofer

Joseph Ritter von Fraunhofer (6 March 1787 – 7 June 1826) was a Bavarian physicist and optical lens manufacturer.

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Jupiter is the fifth planet from the Sun and the largest in the Solar System.

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Jupiter mass

Jupiter mass, also called Jovian mass is the unit of mass equal to the total mass of the planet Jupiter.

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K-type main-sequence star

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 ("red dwarfs") and yellow G-type main-sequence stars.

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Kaj Aage Gunnar Strand

Kaj Aage Gunnar Strand (27 February 1907 – 31 October 2000) was a Danish astronomer who worked in Denmark and the United States He was Scientific Director of the U.S. Naval Observatory from 1963 to 1977.

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Kapteyn's Star

Kapteyn's Star is a class M1 red subdwarf about 12.76 light years from Earth in the southern constellation Pictor; it is the closest halo star to the Solar System.

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Königsberg is the name for a former German city that is now Kaliningrad, Russia.

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Light pollution

Light pollution, also known as photopollution, is the presence of anthropogenic light in the night environment.

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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.

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List of Arabic star names

This is a list of traditional Arabic names for stars.

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List of nearest stars and brown dwarfs

The following two lists include all the known stars and brown dwarfs that are within of the Sun, or were/will be within in the astronomically near past or future.

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Main sequence

In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.

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McDonald Observatory

The McDonald Observatory is an astronomical observatory located near the unincorporated community of Fort Davis in Jeff Davis County, Texas, United States.

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Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.

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Mission of Gravity

Mission of Gravity is a science fiction novel by American writer Hal Clement.

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Mu Cassiopeiae

Mu Cassiopeiae (μ Cas, μ Cassiopeiae) is a binary star system in the constellation Cassiopeia.

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Naked eye

Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying or light-collecting optical instrument, such as a telescope or microscope.

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The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.

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Neptune is the eighth and farthest known planet from the Sun in the Solar System.

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Orbital eccentricity

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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Orbital elements

Orbital elements are the parameters required to uniquely identify a specific orbit.

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Orbital period

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.

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Orion (constellation)

Orion is a prominent constellation located on the celestial equator and visible throughout the world.

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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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Peter van de Kamp

Piet van de Kamp (December 26, 1901 in KampenLaurence W. Fredrick,, Publications of the Astronomical Socitiey of the Pacific 108:556-559, July 1996 – May 18, 1995 in Amsterdam), known as Peter van de Kamp in the United States, was a Dutch astronomer who lived most of his life in the United States.

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Pi Mensae

Pi Mensae (π Men), also known as HD 39091, is a yellow dwarf star in the constellation of Mensa.

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A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

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Procyon, also designated Alpha Canis Minoris (α Canis Minoris, abbreviated Alpha CMi, α CMi), is the brightest star in the constellation of Canis Minor.

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Proper motion

Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.

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Pulkovo Observatory

The Pulkovo Astronomical Observatory (Пу́лковская астрономи́ческая обсервато́рия, official name The Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, Гла́вная (Пу́лковская) астрономи́ческая обсервато́рия Росси́йской акаде́мии нау́к; formerly Imperial Observatory at Pulkowo), the principal astronomical observatory of the Russian Academy of Sciences, located 19 km south of Saint Petersburg on Pulkovo Heights above sea level.

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Radial velocity

The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point.

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Right ascension

Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.

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Saint Petersburg

Saint Petersburg (p) is Russia's second-largest city after Moscow, with 5 million inhabitants in 2012, part of the Saint Petersburg agglomeration with a population of 6.2 million (2015).

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San Francisco State University

San Francisco State University (commonly referred to as San Francisco State, SF State and SFSU) is a public research university located in San Francisco, California, United States.

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Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.

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Sirius (a romanization of Greek Σείριος, Seirios,."glowing" or "scorching") is a star system and the brightest star in the Earth's night sky.

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Smithsonian Astrophysical Observatory

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).

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Space Interferometry Mission

The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope proposed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman.

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Sproul Observatory

Sproul Observatory was an astronomical observatory owned and operated by Swarthmore College.

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Star catalogue

A star catalogue (Commonwealth English) or star catalog (American English), is an astronomical catalogue that lists stars.

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Star system

A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.

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Stars and planetary systems in fiction

The planetary systems of stars other than the Sun and the Solar System are a staple element in many works of the science fiction genre.

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Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

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Stellar kinematics

In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space.

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Stellar magnetic field

A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star.

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Stellar parallax

Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.

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Stellar rotation

Stellar rotation is the angular motion of a star about its axis.

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The Sun is the star at the center of the Solar System.

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Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas.

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The Astronomical Journal

The Astronomical Journal (often abbreviated AJ in scientific papers and references) is a peer-reviewed monthly scientific journal owned by the American Astronomical Society and currently published by IOP Publishing.

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The Astrophysical Journal

The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.

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Thick disk

The thick disk is one of the structural components of about 2/3 of all disk galaxies, including the Milky Way.

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Thomas Henderson (astronomer)

Thomas Henderson FRSE FRS FRAS (28 December 1798 – 23 November 1844) was a Scottish astronomer and mathematician noted for being the first person to measure the distance to Alpha Centauri, the major component of the nearest stellar system to Earth, the first to determine the parallax of a fixed star, and for being the first Astronomer Royal for Scotland.

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Traditional Chinese star names

Traditional Chinese star names (Chinese:, xīng míng) are the names of stars used in ancient Chinese astronomy and astrology.

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University of Illinois at Urbana–Champaign

The University of Illinois Urbana–Champaign (also known as U of I, Illinois, or colloquially as the University of Illinois or UIUC) is a public research university in the U.S. state of Illinois and the flagship institution of the University of Illinois System.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

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Variable star designation

Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.

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Vega, also designated Alpha Lyrae (α Lyrae, abbreviated Alpha Lyr or α Lyr), is the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus.

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W. M. Keck Observatory

The W. M. Keck Observatory is a two-telescope astronomical observatory at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state of Hawaii.

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William Herschel

Frederick William Herschel, (Friedrich Wilhelm Herschel; 15 November 1738 – 25 August 1822) was a German-born British astronomer, composer and brother of fellow astronomer Caroline Herschel, with whom he worked.

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Wulff-Dieter Heintz

Wulff-Dieter Heintz (3 June 1930 – 10 June 2006) was a German astronomer who worked the latter part of his career in the United States.

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Yerkes Observatory

Yerkes Observatory is an astronomical observatory in Williams Bay, Wisconsin operated by the University of Chicago Department of Astronomy and Astrophysics.

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16 Cygni

16 Cygni or 16 Cyg is the Flamsteed designation of a triple star system approximately 69 light-years away from Earth in the constellation of Cygnus.

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16 Cygni Bb

16 Cygni Bb or HD 186427 b is an extrasolar planet approximately 69 light-years away in the constellation of Cygnus.

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Redirects here:

61 Cyg, 61 Cygni A, 61 Cygni AB, 61 Cygni B, 61 Cyngi, 61-Cygni, Bessel's Star, HD 201091, HD 201092, Piazzi's Flying Star, V1803 Cygni.


[1] https://en.wikipedia.org/wiki/61_Cygni

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