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・ Tau Boötis
・ Tau Boötis b
・ Tau Cancri
・ Tau Canis Majoris
・ Tau Capricorni
・ Tau Cassiopeiae
・ Tau Centauri
・ Tau Ceti
・ Tau Ceti (video game)
・ Tau Ceti e
・ Tau Ceti f
・ Tau Ceti in fiction
・ Tau conjecture
・ Tau Coronae Borealis
・ Tau Cross
Tau Cygni
・ Tau Daha
・ Tau Delta Phi
・ Tau Devi Lal Cricket Stadium
・ Tau Devi Lal Stadium
・ Tau Draconis
・ Tau effect
・ Tau emerald
・ Tau Epsilon Phi
・ Tau Eridani
・ Tau function
・ Tau Gamma Phi
・ Tau Gamma Sigma
・ Tau Geminorum
・ Tau Gruis


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Tau Cygni : ウィキペディア英語版
Tau Cygni


Tau Cygni (τ Cyg) is a binary star system in the constellation Cygnus, approximately 69 light years away from Earth.〔 This visual binary system has a period of 49.6 years.〔
The main star, 4th magnitude GJ 822.1 A, is a yellowish white subgiant star of the spectral type F2IV. It therefore has a surface temperature of 6,000 to 7,500 kelvins and is larger, hotter, and several times as bright as our Sun.〔 Its companion, 6th magnitude GJ 822.1 B, is a yellow main sequence star of the spectral type G0V. It is similar to our Sun in size, surface temperature, and luminosity.〔
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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