near-parabolic orbit
31Oberth effect — In astronautics, the Oberth effect is where the use of a rocket engine when travelling at high speed generates much more useful energy than one at low speed. Oberth effect occurs because the propellant has more usable energy (due to its kinetic… …
32Mir — This article is about the Soviet/Russian space station. For other uses, see Mir (disambiguation). Mir …
33n-body problem — This article is about the problem in classical mechanics. For the problem in quantum mechanics, see Many body problem. The n body problem is the problem of predicting the motion of a group of celestial objects that interact with each other… …
34Delta-v budget — (or velocity change budget) is an astrogation term used in astrodynamics and aerospace industry for total delta v (or total velocity change) requirements for the various propulsive tasks and orbital maneuvers over phases of a space mission.… …
35Orbital period — For the music album, see Orbital Period (album). The orbital period is the time taken for a given object to make one complete orbit about another object. When mentioned without further qualification in astronomy this refers to the sidereal period …
36Orbital elements — are the parameters required to uniquely identify a specific orbit. In celestial mechanics these elements are generally considered in classical two body systems, where a Kepler orbit is used (derived from Newton s laws of motion and Newton s law… …
37Retrograde motion — This article is about retrograde motions of celestial bodies relative to a gravitationally central object. For the apparent motion as seen from a particular vantage point, see Apparent retrograde motion. Retrograde orbit: the satellite (red)… …
38Orbital station-keeping — In astrodynamics orbital station keeping is a term used to describe the orbital maneuvers made by thruster burns that are needed to keep a spacecraft in a particular assigned orbit. For many Earth satellites the effects of the non Keplerian… …
39Orbital inclination — For the science fiction novella by William Shunn, see Inclination (novella). Fig. 1: One view of inclination i (green) and other orbital parameters Inclination in general is the angle between a reference plane and another plane or axis of… …
40Semi-major axis — The semi major axis of an ellipse The major axis of an ellipse is its longest diameter, a line that runs through the centre and both foci, its ends being at the widest points of the shape. The semi major axis is one half of the major axis, and… …
