Every comet is different, and they travel at different speeds at different points in their orbits. They can travel in the range from 2 – 40 kilometers per sec depending on how close to the Sun they get. When they are very far away from the Sun, their speeds can be as low as a few kilometers per second. Close to the Sun, they can get well into the double-digits.
If you know a few things about the orbit of a particular asteroid, you can calculate its speed using the equation:
v^2 = GM( 2/r – 1/a) v – VelocityG – gravitational constant = 6.67300 × 10-11 m3 kg-1 s-2 M – Mass of the body its orbitingr – distance to the comet from Ma – the semi – major axis distance
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