Science · 6 pages · 12 min
How a Lagrange point stays put
A Lagrange point is fixed only in the rotating view of two orbiting bodies.
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From the opening
A Lagrange point is a place, in the frame that rotates with two orbiting bodies, where a small third body can keep a fixed relation to them. Gravitational pulls and the centrifugal tendency in that rotating view balance, so the small body need not drift at once. The opening covers balance in a rotating frame, why L1 and L2 need fuel, and why L4 and L5 can hold debris.
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Inside
- Balance in a rotating frame
- Why L1 and L2 need fuel
- Why L4 and L5 can hold debris
- What a halo orbit is doing
- Where the idea stops applying
- A distinction worth keeping
Sources
- Lagrange points in the restricted three-body problem
- Halo orbits about the collinear points