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# Elliptical Orbits - PowerPoint PPT Presentation

Elliptical Orbits. Cali & Paul. Definition. Elliptical Orbits  An elliptical orbit that has an eccentricity less than 1 and is also known as a Kepler orbit. Definition Cont.

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### Elliptical Orbits

Cali & Paul

• Elliptical Orbits  An elliptical orbit that has an eccentricity less than 1 and is also known as a Kepler orbit

• Ellipse: An oval-shaped curve that is a path of a point that moves such that the sum of its distances from two fixed points (foci) is constant.

• Foci: One of the two points for which the sum of the differences to any point on the ellipse is a constant.

• Ex  A satellite orbiting Earth moves an ellipse that has Earth as one focus.

• The orbit of a satellite is shown in a sketch. In which of the positions A through D does the satellite have the greatest speed? Least speed?

C

D

B

A

• Position A because the satellite gains momentum as it begins its orbit and as it descends back to its original point, its momentum is greatest.

• Position C because the satellite gains momentum as it begins its orbit and as it enters the middle of its orbit, its speed is least.