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Use the “clear optional features” button to remove the 1st Law features.
Question 12: (1 point) Erase all sweeps and create an ellipse with a = 1 AU and e = 0.Set the fractional sweep size to one-twelfth of the period. Drag the sweepsegment around. Does its size or shape change? No changes on size orNAAP – Planetary Orbit Simulator 5/9
Question 13: (1 point) Leave the semi-major axis at a = 1 AU and change theeccentricity to e = 0.5. Drag the sweep segment around and note that its size andshape change. Where is the sweep segment the “skinniest”? Where is it the“fattest”? Where is the planet when it is sweeping out each of these segments?(What names do astronomers use for these positions?)
Question 14: (1 point) What eccentricity in the simulator gives the greatest variationof sweep segment shape?
Question 15: (1 point) Halley’s comet has a semimajor axis of about 18.5 AU, aperiod of 76 years, and an eccentricity of about 0.97 (so Halley’s orbit cannot beshown in this simulator.) The orbit of Halley’s Comet, the Earth’s Orbit, and theSun are shown in the diagram below (not exactly to scale). Based upon what youknow about Kepler’s 2ndLaw, explain why we can only see the comet for about 6months every orbit (76 years)?
NAAP – Planetary Orbit Simulator 6/9
Kepler’s 3rdLaw

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