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From measurements of its motion, German astronomer Friedrich Wilhelm Bessel deduced that Sirius, the brightest star in the night sky, had an unseen companion.
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Friedrich Wilhelm Bessel
German astronomer and mathematician (1784–1846)
Friedrich Wilhelm Bessel was a German astronomer, mathematician, physicist, and geodesist. He was the first astronomer who determined reliable values for the distance from the Sun to another star by the method of parallax. Certain important mathematical functions were first…Source: Wikipedia (CC BY-SA)
Sirius
Brightest star in the night sky, in the constellation Canis Major
Sirius is the brightest star in the night sky. Its name is derived from the Greek word Σείριος (Latin script: Seirios; lit. 'glowing' or 'scorching'. The star is designated α Canis Majoris, Latinized to Alpha Canis Majoris, and abbreviated α CMa or Alpha CMa. With a visual…Source: Wikipedia (CC BY-SA)
List of brightest stars
Stars sorted by apparent magnitude
This is a list of stars arranged by their apparent magnitude – their brightness as observed from Earth. It includes all stars brighter than magnitude +2.50 in visible light, measured using a V-band filter in the UBV photometric system. Stars in binary systems are listed by their…Source: Wikipedia (CC BY-SA)