61 Cygni is a binary star system in the constellation Cygnus.
Both stars have a spectral type of K, which means there temperature is around
4,500 K. This is cool for a star.
See related question for the hottest star.
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Something is missing from your question. Cygni is not a star. The constellation name is Cygnus. The star will have a name like Alpha Cygni or 25 Cygni.
Cygni is a star system in the Cygnus constellation. The primary star, Cygni A, is a blue-white star with a temperature around 19,000 K. The companion star, Cygni B, is a yellow-white star with a temperature around 8,500 K.
61 Cygni is a binary star system consisting of two orange dwarfs. Because of this configuration it is unlikely that any planets would have been able to form because of the gravitational tug of the two stars. To date, no planets have been confirmed in this system.
Friedrich Wilhelm Bessel measured its distance from Earth at about 10.4 light years, very close to the actual value of about 11.4 light years; this was the first distance estimate for any star other than the Sun,[13] and first star to have its stellar parallax measured.
The temperature of Cygni, or specifically the star Deneb (also known as Alpha Cygni), is estimated to be around 8,500 Kelvin. This makes it a very hot and luminous star compared to our Sun, which has a surface temperature of about 5,500 Kelvin.