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Eccentricity and Elliptical Orbits

Eccentricity and Elliptical Orbits. All planets revolve around the Sun in an elliptical orbit. The name of that shape is an ellipse. An ellipse is an oval shape. Ellipse. Eccentricity is the measure of how out of round an orbit is.

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Eccentricity and Elliptical Orbits

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  1. Eccentricity and Elliptical Orbits All planets revolve around the Sun in an elliptical orbit. The name of that shape is an ellipse. An ellipse is an oval shape. Ellipse Eccentricity is the measure of how out of round an orbit is. This means it is a number that represents the shape of an orbit. The eccentricity # ranges from 0 to 1. 11 The e = 0.5 The e = 0 The e = 0.8 Mrs. Degl

  2. e = eccentricity d = distance between foci L = length of the major axis e = d L L f 1 and f 2 are each a foci. One focus is always a star. Our solar system has the Sun as a focus. d f 1 f 2 Mrs. Degl

  3. To draw an ellipse: • You must carefully place two push pins in a piece of cardboard. The push pins must be the proper distance apart. Each push pin represents one focus. The distance between them is called the “distance between foci”. • Next, you must place your loop of string around both push pins. • Last, you must drag your pencil around the inside of the string. This will create your ellipse. Mrs. Degl

  4. Helpful Hints No Units • The eccentricity formula is on the front cover of your ESRT’s. • An eccentricity close to the # 1 means that the orbit is VERY elliptical. It looks like an oval shape. (The # 1 looks like a straight line, and a shape like is almost a straight line.) 3. An eccentricity close to zero means that the orbit is NOT VERY ECCENTRIC or it is almost a circle. (Zero looks like a circle ) Mrs. Degl

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