10.12.15. 07 Astronomy Notes

# 10.12.15. 07 Astronomy Notes - 10.12.2007 Astronomy Mass p2...

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10.12.2007 – Astronomy Mass: p 2 = [4π 2 / G(M+m)] * a 3 ≈ [4π 2 / GM] * a3 p 2 ~ a 3 /M M ~ a 3 /p 2 For homework, look at parallax problems. Theta/360 = d/2piD R = pi/360 * thetaD Rotation period: observable Density: tells a lot about what a planet is made of Metals = 8000 kg/m^3 Rocks = 2000 - 3000 kg/m^3 Water/Ice = 1000 kg/m^3 Average density: M / [4pi/3 r^3] = 3 / 4pi * M / r^3 M = a^3 / p^2. a in Au, p in years 10.15.2007 Layout of the solar system - Counter clockwise orbits (planets, sun). also mostly counter clockwise rotations. o Exceptions only to rotation: Venus, Uranus - Co-planar orbits - Circular orbits - Differentiation o Why are the terrestrials close to sun and Jovians far o Explain asteroids, Kuiper Belt Objects (KBO) Terrestrial (Earth-like) Jovian (Jupiter-like) - Close to sun - far from sun - Closely spaced - widely spaced - Small masses

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