ASTA01H3 Study Guide - Midterm Guide: Angular Diameter, Light-Year, Celestial Equator
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An asteroid has an aphelion distance of 4. 6 a. u. and a perihelion distance of 1. 8 a. u. An asteroid has a perihelion distance of 2. 0 au and an aphelion distance of 4. 0 au. P = a3/2 = (3. 0)3/2 = 5. 20 years. Halley"s comet has a perihelion of 0. 6 au and an orbital period of 76 years. The period gives the semi-major axis of the orbit a3 = p2 a = p2/3 = (76 au)2/3 = 17. 9 au,ra + rp = 2a so. [halley"s comet reaches maximum distance from the sun between the orbits of neptune and pluto] What would be the orbital period at a distance of 5 light-year. For a period of 5 million years, you need to solve: (5,000,000)^2 = t^3 you should get t = 29,240 au, which is about 0. 462 light-years. At a distance of 5 light-years, that is 316,200 au.
