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Old February 23rd 16, 07:10 AM posted to sci.astro
Poutnik[_5_]
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Default 3rd Kepler law, twin stars, centres, and semi major axis

Dne 23/02/2016 v 00:34 Peter Riedt napsal(a):


Orbits of any solar object is calculated by Kepler's laws not Newton's.

False. think about it little bit more.

Calculate orbit of an asteroid 20 km big with density 2 g/ccm
with an orbit identical to the Jupiter one, but 5 percent smaller,
being at t=0 in conjunction.

Tell by Kepler laws, how the orbit will look after 1000 years,
considering gravitational disturbation of the Jupiter.

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Kepler laws are by design focused on 2 body systems only.
They are principally inaccurate for systems with more than 2 bodies,
as they do not take into account the influence of other bodies.

This influence is very significant especially for small objects
as asteroids and comets that frequently change their orbits due big
objects. Close passes and orbit resonances are especially powerful.

--
Poutnik ( the Czech word for a wanderer )

Knowledge makes great men humble, but small men arrogant.