That depends! It's like asking if a car or a house is bigger - it really depends on which specific car and which specific house you're comparing.

* Asteroids: These are rocky bodies that orbit the sun. They come in all shapes and sizes, from small pebbles to dwarf planets like Ceres, which is about 950 kilometers in diameter.

* Satellites: These are objects that orbit a planet or other celestial body. They can be natural, like our moon, or artificial, like the International Space Station. Artificial satellites are generally much smaller than asteroids, but natural satellites can be huge.

So, the answer is:

* Some asteroids are much bigger than any satellite.

* Some satellites are much bigger than some asteroids.

To know for sure, you'd need to compare the specific asteroid and satellite you're interested in.