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SOS Background Info - Orbits and Energy (546 words) |
 | A Keplerian orbit is a closed ellipse, where the pericenter and apocenter distances are determined by the energy and angular momentum of the orbit. |
| However, the orbits of stars in a galaxy are not Keplerian, because the mass distribution is not concentrated in a point mass. |
| Orbits form a rosette, in which a star will eventually pass through every point on an annulus whose inner and outer radii are the pericenter and apocenter distances determined by the energy and angular momentum of the orbit. |
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Planetary orbit - Wikipedia, the free encyclopedia (2765 words) |
| First, he found that the orbits of the planets in our solar system are elliptical, not circular (or epicyclic), as had previously been believed, and that the sun is not located at the center of the orbits, but rather at one focus. |
| In the case of an open orbit, the speed at any position of the orbit is at least the escape velocity for that position, in the case of a closed orbit, always less. |
| The gravity of the orbiting object raises tidal bulges in the primary, and since below the synchronous orbit the orbiting object is moving faster than the body's surface the bulges lag a short angle behind it. |
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