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61 Cygni is a star in the constellation Cygnus. Though it is among the least conspicuous of stars visible in the night sky to an observer without an optical instrument, 61 Cygni attracted the attention of astronomers due to its large proper motion.
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61 CYG (61 Cygni). Cygnus holds a seminal star, one not much appreciated within the classical figure that makes the celestial Swan and its famed asterism, the Northern Cross (the Swan tipped upside-down).
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61 Cygni Photo: ESO Online Digitized Sky Survey A nearby binary star system that consists of two orange-red K-type dwarfs moving in a highly elongated orbit about each other with a mean separation of about double the distance from Pluto to the Sun.
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61 Cygni was christened the "Flying Star" in 1792 by Giuseppe Piazzi (1746-1826) for its unusually large proper motion. This binary system is located about 11.4 light-years (ly) away from our Sun, Sol, in the south central part (21:08:52.
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61 Cygni (or Bessel's star) was a star system consisting of binary companion stars, 61 Cygni A and 61 Cygni B, located about 11.4 light years from Sol.
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61 Cygni also holds the distinction of being the first star to have its parallax measured. This occurred in 1838, by Friedrich Wilhelm Bessel, a German astronomer. Variable stars in Cygnus: ...
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61 Cyg became famous not only because it is an attractive and easily resolvable object for small telescopes, but because it lies in a distance of only 11.1 lightyears. Its the first star which distance was actually measured.
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Identification of stars within a given constellation includes use of Bayer designations such as Alpha Centauri, Flamsteed designations such as 61 Cygni, and variable star designations such as RR Lyrae.
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17, 1846) was a German astronomer and mathematician who cataloged about 50,000 stars, mathematically predicted the existence of a planet beyond Uranus (1840), was the first person to see the "motion" of a star due to parallax (observing 61 Cygni), ...
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3 Sir R. Ball's measurements at Dunsink gave to 61 Cygni a parallax of 0.47"; Professor Pritchard obtained, by photographic determinations, one of 0.43" ...
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Friedrich Bessel 1784-1846 Prussian first to measure distance to the star 61 Cygni; proposed that Sirius has an unseen companion; worked out the mathematical analysis of what are now known as Bessel functions ...
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In 1812 Bessel measured with it the angle between the components of the double star 61 Cygni and observed the great comet of 1811. He also observed the eclipse of the sun on May 4, 1818.
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Parallax is the apparent change in the position of a star that is caused only by the motion of the Earth as it orbits the Sun. Friedrich Wilhelm Bessel first detected the parallax "motion" of a star in 1838 observing the star 61 Cygni (this was ...
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Superconductor-Insulator-Superconductor Junction. Can be used as the mixer in a radio receiver system. [McL97] 61 Cygni ...
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Only in 1838 were definite parallaxes measured for some of the nearest stars--for Alpha Centauri by Henderson from South Africa, for Vega by Friedrich von Struve and for 61 Cygni by Friedrich Bessel.
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stars consecutively in each constellation in the order that Flamsteed had listed them, and this is the system that astronomers mean when they speak of Flamsteed numbers. Stars are usually referred to by their Flamsteed numbers - for example 61 Cygni ...
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There he produced his great catalog of the positions of 7,646 stars and demonstrated that most stars are in motion relative to the Sun. There also he discovered Ceres and the high proper motion of the important double star 61 Cygni.
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Galileo was not able with the best of his telescopes to discern the slightest stellar parallax. This was a valid scientific objection, and it was not answered until 1838, when Friedrich Bessel succeeded in determining the parallax of star 61 Cygni.
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 See also: 61 Cygni, Star, Earth, Distance, Light
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