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==The Stars==

==The Stars==

Although barely visual to the naked eye and appearing as a single star, 61 Cygni is actually a binary star, each which orbit around a common barycenter only every 659 years.  The average distance of the pair from each other is 86 AUs, but the large orbital eccentricity means the stars approach as close as 44 AUs and as distant as 124 AUs during their orbit<ref name="61Cygni">http://solstation.com/stars/61cygni2.htm</ref>.

Although barely visual to the naked eye and appearing as a single star, 61 Cygni is actually a binary star, each which orbit around a common barycenter only every 659 years.  The average distance of the pair from each other is 86 AUs, but the large orbital eccentricity means the stars approach as close as 44 AUs at periastron and are as distant as 124 AUs at apastron during their orbit<ref name="61Cygni">http://solstation.com/stars/61cygni2.htm</ref>.

Both stars are K class sub-dwarfs, 61 Cygni A is the slightly larger ''primary'' with 70 percent of our sun's mass, 72 percent of its diameter, but only some 8.5 percent of its luminosity.  61 Cygni B, the ''secondary'' is only 3some 63 percent of our sun's mass, 67 percent of its diameter, and only half as luminous as 61 Cygni A, or about 4 percent as much as our sun<ref name="61Cygni">http://solstation.com/stars/61cygni2.htm</ref>.

Both stars are K class sub-dwarfs, 61 Cygni A is the slightly larger ''primary'' with 70 percent of our sun's mass, 72 percent of its diameter, but only some 8.5 percent of its luminosity.  61 Cygni B, the ''secondary'' is only 3some 63 percent of our sun's mass, 67 percent of its diameter, and only half as luminous as 61 Cygni A, or about 4 percent as much as our sun<ref name="61Cygni">http://solstation.com/stars/61cygni2.htm</ref>.