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There are five Lagrange points for the Sun–Earth system, and five different Lagrange points for the Earth–Moon system. L 1, L 2, and L 3 are on the line through the centers of the two large bodies, while L 4 and L 5 each act as the third vertex of an equilateral triangle formed with the centers of the two large bodies.
Sun–Earth L 1: NASA: Planned for launch in early 2025. Space Weather Follow On - Lagrange 1 (SWFO-L1) Sun–Earth L 1: NOAA: Planned for launch in early 2025 as a rideshare to IMAP. Planetary Transits and Oscillations of stars (PLATO) Sun–Earth L 2: ESA: Planned for launch in 2026 for an initial six-year mission. [55] Space Infrared ...
A halo orbit is a periodic, three-dimensional orbit associated with one of the L 1, L 2 or L 3 Lagrange points in the three-body problem of orbital mechanics.Although a Lagrange point is just a point in empty space, its peculiar characteristic is that it can be orbited by a Lissajous orbit or by a halo orbit.
In the special case of the circular restricted three-body problem, these solutions, viewed in a frame rotating with the primaries, become points called Lagrangian points and labeled L 1, L 2, L 3, L 4, and L 5, with L 4 and L 5 being symmetric instances of Lagrange's solution.
To escape the Solar System from a location at a distance from the Sun equal to the distance Sun–Earth, but not close to the Earth, requires around 42 km/s velocity, but there will be "partial credit" for the Earth's orbital velocity for spacecraft launched from Earth, if their further acceleration (due to the propulsion system) carries them ...
Another example of the use of the ITN was NASA's 2001–2003 Genesis mission, which orbited the Sun–Earth L 1 point for over two years collecting material, before being redirected to the L 2 Lagrange point, and finally redirected from there back to Earth. [1] The 2003–2006 SMART-1 of the European Space Agency used another low energy ...
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The X/Y plane coincides with Earth's equatorial plane, with the +X axis pointing toward the vernal equinox and the Y axis completing a right-handed set. The ECI reference frame is not truly inertial because of the slow, 26,000 year precession of Earth's axis , so the reference frames defined by Earth's orientation at a standard astronomical ...