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El problema de Kepler

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• <strong>El</strong>ección <strong>de</strong>l plano θ = π/2<br />

⎧<br />

⎪⎨<br />

⎪⎩<br />

• Potencial efectivo<br />

E = 1<br />

2 ( ˙r2 + r 2 ˙ϕ 2 ) − GM<br />

r<br />

J = r 2 ˙ϕ (⇒ ˙ A = J/2)<br />

E = 1<br />

2 ˙r2 + Φef(r) , Φef(r) ≡<br />

⎧<br />

2<br />

⎪⎨<br />

J 1<br />

Φef(r) = 0 ⇒ r = ≡<br />

2GM 2 p<br />

⎪⎩ Φ ′ ef(r) = 0 ⇒ r =<br />

J 2<br />

GM<br />

= p<br />

4<br />

2 J GM<br />

−<br />

2r2 r<br />

(figura)<br />

(figura)<br />

⇒ Φef(p) = − GM<br />

2p

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