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El problema de Kepler

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• Vector <strong>de</strong> Runge–Lenz<br />

→ Ecuación <strong>de</strong> la órbita<br />

e = 1<br />

GM v ∧ J − r<br />

r ⇒<br />

⎧<br />

⎪⎨<br />

⎪⎩<br />

e · J = 0<br />

<strong>de</strong><br />

dt<br />

= 0<br />

⇒ G 2 M 2 (e 2 − 1) = 2EJ 2<br />

e · r = er cos(ϕ − ϕ0) =<br />

J 2<br />

GM<br />

7<br />

(verificarlo)<br />

− r ♣ (figura)

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