The asteroid Ceres has a mass of 7 1020 kg and a radius of 500 km What is g on the surface of Ceres?
g=GM/r2 N m2/kg2
r= 500,000 m
about 0.02 g
10*1015power of 45
The dwarf planet Ceres is by far the most massive asteroid, constituting nearly 1/3 of the total mass of the asteroid belt : 9.43 x 1020 kg (about 1 quintillion tonnes). This is, however, only 1/70th the mass of Earth's Moon. The next largest asteroids are Vesta (about 1/4 the mass of Ceres at 2.59 x 1020 kg) Pallas (about 1/5 the mass of Ceres at 2.11 x 1020 kg)
One of the largest asteroids, Ceres was discovered in 1801. With its estimated average radius of about 461 km, and its estimated mass of 9.43 x 1020 kg (0.00015 of Earth's mass, 0.0128 of the Moon's mass), the acceleration of gravity on its surface is estimated at 0.27 m/s2, or 2.8% of its value on the Earth's surface. If you weigh 150 pounds on Earth, you'll weigh about 4pounds 2.1ounces on Ceres.