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Its companion, Sirius B, is a star that has already evolved off the main sequence and become a white dwarf. Currently 10,000 times less luminous in the visual spectrum, Sirius B was once the more massive of the two. [84] The age of the system has been estimated at 230 million years.
White dwarf - Wikipedia
The Sun is the brightest star as viewed from Earth, at −26.78 mag.The second brightest is Sirius at −1.46 mag. For comparison, the brightest non-stellar objects in the Solar System have maximum brightnesses of:
astro: approximate luminosity of Sirius B, Sirius's white dwarf companion. [63] [64] 10 26: 1 × 10 26 W tech: power generating capacity of a Type-II civilization on the Kardashev scale. [56] 1.87 × 10 26 W astro: approximate luminosity of Tau Ceti, the nearest solitary G-type star. 3.828 × 10 26 W astro: luminosity of the Sun, [65] our home ...
Sirius: Binary star system: Brightest night star −0.74 Canopus: Star −0.29 [7] Alpha Centauri AB Binary star system Part of a triple star system with Proxima ...
An artist's impression of Sirius A and Sirius B, a binary star system.Sirius A, an A-type main-sequence star, is the larger of the two. An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class V (five).
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Its name comes from the Greek word for "scorching" or "searing". Sirius is also a binary star; its companion Sirius B is a white dwarf with a magnitude of 8.4–10,000 times fainter than Sirius A to observers on Earth. [32] The two orbit each other every 50 years. Their closest approach last occurred in 1993 and they will be at their greatest ...