description Sirius B Overview
Sirius B is a dense white dwarf star orbiting within the Sirius system of Canis Major. It represents the remnant core of a once-massive star that exhausted its nuclear fuel. This object’s extreme density—a sun's mass packed into Earth-sized volume—makes it a valuable subject for astronomical research and provides insights into stellar evolution. Astronomers study Sirius B to understand white dwarf formation, properties, and their role in binary systems.
insights Ranking position
Sirius B ranks #16 of 212 in the Star ranking, behind Canopus, ahead of Altair.
help Sirius B FAQ
What type of star is Sirius B?
Sirius B is a white dwarf star, which is the remnant core of a star that has exhausted its nuclear fuel. It is the closest white dwarf to Earth, located in the Canis Major constellation.
How does the mass of Sirius B compare to the Earth?
Sirius B is incredibly dense, packing roughly the same mass as our Sun into a volume nearly equivalent to Earth's. This means its surface gravity is about 400,000 times that of Earth.
Who discovered Sirius B?
The star was first observed directly by the American astronomer Alvan Graham Clark in 1862. However, its existence had been predicted earlier by Friedrich Bessel in 1844 due to irregularities in the proper motion of Sirius A.
What is the orbital period of Sirius B around Sirius A?
Sirius B orbits the main-sequence star Sirius A in an elliptical orbit that takes about 50 years to complete. The distance between the two stars varies from about 8 to 31 astronomical units.
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