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<blockquote data-quote="Nyeshet" data-source="post: 2354302" data-attributes="member: 18363">For those interested in odd orbitsHere is another link for you to look at: <a href="http://www.ifmo.ru/butikov/Projects/Collection2.html" target="_blank">http://www.ifmo.ru/butikov/Projects/Collection2.html</a>It deals with simulations of threebody problems. This particular page presumes an earth, a moon, and a very very small (in mass) third body. Orbits 1 and 2 are good for an oddly orbitting lesser moon - so too is orbit 5, albeit in an entirely different manner. And orbit 6, although retroactively. These four are the only stable orbits on the page. All others eventually lead to a toss out or (more often) an impact on the moon or the planet (depending on the orbit and the starting conditions). Orbits 3 and 4 are good for doomsday asteroid. Assuming about 12 'moons' in a year, then the almost 90 degree impact (on the planet or main moon, respectively) take about half a year and dozens of odd orbits around both the planet and the major moon before it occurs. Orbit 7 would likely end in impact if the simulation lasted long enough. It takes many orbits for the instabilities to show. However, in the description it points out that for the earth/moon system, the triangluar libration point would be stable. Orbits 8, 9, and 10 demonstrate the instability of inner and outter collinear lagrange points. Basically more cases of one or more bodies either being thrown out or pulled in for impact.</blockquote>

[QUOTE="Nyeshet, post: 2354302, member: 18363"] [b]For those interested in odd orbits[/b] Here is another link for you to look at: [url]http://www.ifmo.ru/butikov/Projects/Collection2.html[/url] It deals with simulations of threebody problems. This particular page presumes an earth, a moon, and a very very small (in mass) third body. Orbits 1 and 2 are good for an oddly orbitting lesser moon - so too is orbit 5, albeit in an entirely different manner. And orbit 6, although retroactively. These four are the only stable orbits on the page. All others eventually lead to a toss out or (more often) an impact on the moon or the planet (depending on the orbit and the starting conditions). Orbits 3 and 4 are good for doomsday asteroid. Assuming about 12 'moons' in a year, then the almost 90 degree impact (on the planet or main moon, respectively) take about half a year and dozens of odd orbits around both the planet and the major moon before it occurs. Orbit 7 would likely end in impact if the simulation lasted long enough. It takes many orbits for the instabilities to show. However, in the description it points out that for the earth/moon system, the triangluar libration point would be stable. Orbits 8, 9, and 10 demonstrate the instability of inner and outter collinear lagrange points. Basically more cases of one or more bodies either being thrown out or pulled in for impact. [/QUOTE]

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