Is Arcturus Sirius Altair or Betelgeuse the closest star to our solar system?

Sirius is the closest star system to our solar system, located about 8.6 light-years away. It is part of the constellation Canis Major and consists of two stars, Sirius A and Sirius B. In contrast, Arcturus, Altair, and Betelgeuse are farther away, with Arcturus being approximately 36.7 light-years from us, Altair around 16.7 light-years, and Betelgeuse about 642.5 light-years distant.