What would happen to the solar system if Jupiter became a star

Jupiter is a giant planet, one-thousandth the mass of the sun, but 2.5 times the mass of the other planets in the solar system combined. Of the planets in the solar system, Jupiter and Saturn are gas giants. Jupiter is seen from the earth, its apparent magnitude can reach -2.94, and it can already cast a shadow, making it the third brightest celestial body in the night sky on average after the moon and Venus.