Exact(5)
After obtaining the analytical solutions of the bounded orbits around triangular points, the target orbits in practical missions can be expressed by several related parameters.
In particular, when the eccentricity of the primary is zero, the series expansions constructed can be reduced to describe the motion around triangular libration points in CRTBP.
The series expansions truncated at arbitrary order are constructed by means of Lindstedt Poincaré method, and then the quasi-periodic orbits around triangular libration points in ERTBP can all be parameterized.
Thanks to the series expansions constructed, two missions are planned to transfer a spacecraft from the Earth to the short periodic orbits around triangular libration points of Earth Moon system.
High-order series expansions around triangular libration points in the elliptic restricted three-body problem (ERTBP) are constructed first, and then with the aid of the series solutions, two-impulse and low-thrust low energy transfers to the triangular point orbits of the Earth Moon system are designed in this paper.
Similar(3)
Two weeks before expected parturition, the sows were moved to a lactation unit where they were loose-housed in individual pens (2.2 × 3.0 m), and where they were free to move around, with a triangular piglet creep area placed in one of the front corners of the pen.
On January 4 , 1981 he set a world record of 1,306.856 km (811.56 miles) for distance around a triangular course.
Seated around a triangular desk in the dark Broadcast Center studio, with professional cutaways and close-ups, the Princetonians looked as they might on Charlie Rose.
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