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 ...
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 A
This star is a orange-red main sequence dwarf star of spectral and luminosity type K3.5-5.0 Ve. It has about 70 percent of Sol's mass (RECONS), 72 percent of its diameter (Johnson and Wright, 1983, page 699), and about 8.
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).
61 Cygni
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61 Cygni, sometimes called Bessel's Star, is a binary star system in the constellation Cygnus.
61 Cygni was the first star successfully observed for parallax. Friedrich Wilhelm Bessel (1784 - 1846) measured the parallax between 1837 and 1840.
Like Sirius B, Procyon B is a white dwarf.
61 Cygni
The first star other than the Sun to have its parallax, and hence distance, measured. The star is a double orange dwarf that lies in the constellation Cygnus 11.4 light-years away.
Skylight ...
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: ...
61 Cygni Star System
61 Cygni A - 11.40 LY [YH]
61 Cygni B - 11.40 LY [YH]
Gl 725 Star System ...
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.
He found that the nearby star 61 Cygni was at a distance of about 3 parsecs, or about 600,000 times the distance from the earth to the sun.
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.
22, 1784-March 17, 1846) was a German 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), ...
FLAMSTEED NUMBER - Combination of a number and the name of a constellation (61 Cygni, 36 Ophiuchi etc.) used to identify naked-eye stars. The numbers were applied to John Flamsteed's star catalogue published in 1725.
What would the distance to 61 Cygni be in light years?
1 parsec = 3.26 light years
∴ 3.5 pc = 3.5 x 3.26 light years
so 61 Cygni is 11.4 light years distant.
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 ...
Beta Cygni
Theta Cygni
Omega Cygni
61 Cygni
Cygnia Minor
Delphinus (Delphini) Dorado (Doradus) Draco (Draconis) ...
The first stellar parallax was measured in 1838 by Friedrich Bessel for the star 61 Cygni. Its parallax of 0.3 places it at a distance of 3.3 parsecs or about 11 light-years. The technique of stellar parallax is useful for stars within 100 parsecs.
1838---Friedrich Bessel and others first measure the distance to the star 61 Cygni, using the diameter of the Earth's orbit as baseline.
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.
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 ...
A famous halo star that lies 28 light-years away in the constellation Ursa Major. Its proper motion, discovered in 1841, was then the largest known, displacing that of 61 Cygni. [C95]
Grotrian Diagram ...
search for extrasolar planets might take us to Epsilon Eridani or Tau Ceti, Sun-like stars at 10.8 and 11.8 light-years away. Rounding out the stellar neighborhood at a distance of about 11 light-years are Epsilon Indi and the binary system 61 Cygni.
Vega, the brightest star in the constellation Lyra is easy to find as part of the triangle with Deneb and Altair, the brightest stars in Cygnus and Aquila. This trio is referred to as the Summer Triangle. 61 Cygni, ...
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 ...
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.
 See also: 61 Cygni, Star, Light, Distance, Sun
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