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Mu naught
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You can measure the distance to an object orbiting the sun using parallax, and you can determine its angular velocity by measuring its change in position over several hours or days.
From this you can calculate its orbit... if it were circular. However, comets and asteroids follow elliptical orbits, not circular ones. How do you determine the true orbit of an object and its eccentricity?
From this you can calculate its orbit... if it were circular. However, comets and asteroids follow elliptical orbits, not circular ones. How do you determine the true orbit of an object and its eccentricity?