Companion of Sirius

Japanese: シリウスの伴星 - シリウスのばんせい(英語表記)Companion of Sirius
Companion of Sirius
Its official name is Sirius B. Its luminosity is 8.54 magnitude. It is a white dwarf of spectral type wA5. In 1834, before its direct discovery, it was predicted to be a binary star based on the meandering proper motion of the primary star A, and was discovered by American A. Clark in 1862. Subsequent observations confirmed that the star's radius is 0.016 times that of the Sun, its mass is 1.02 times that of the Sun, and its density is therefore 400,000 times that of water, making it the first white dwarf ever discovered. (→ Sirius )

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
正式名はシリウスB。光度 8.54等。スペクトル型 wA5の白色矮星。その直接発見より前の 1834年,主星Aの固有運動の蛇行から連星であることが予測され,アメリカの A.クラークが 62年に発見。その後の観測によって,その星の半径は太陽の 0.016倍,質量は太陽の 1.02倍,したがって密度が水の 40万倍に達することが確かめられ,白色矮星発見の第1号となった。 (→シリウス )

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