What is a gravitational assist in space flight dynamics?
A gravitational assist, or gravity assist, is a spaceflight technique where a spacecraft gains speed and alters its trajectory by passing close to a planet, utilising the planet's gravity. This manoeuvre allows the spacecraft to save fuel and reach destinations that would otherwise be unreachable.
What are the key parameters in orbital mechanics?
The key parameters in orbital mechanics include semi-major axis, eccentricity, inclination, right ascension of the ascending node, argument of periapsis, and true anomaly. These elements describe the size, shape, orientation, and position of an orbit.
What is the role of delta-v in space flight dynamics?
Delta-v represents the change in velocity needed for a spacecraft to perform specific manoeuvres, such as orbit insertion, course corrections, or landing. It is crucial for mission planning and fuel requirements, determining a spacecraft's ability to reach, navigate, and return from different celestial destinations.
How do thrusters control a spacecraft's orientation?
Thrusters control a spacecraft's orientation by producing torque through the application of small, directed bursts of thrust. These bursts are meticulously timed and positioned around the spacecraft's centre of mass to achieve the desired rotational movement in pitch, yaw, or roll axes. This process is known as attitude control.
What are Lagrange points in space flight dynamics?
Lagrange points are positions in space where the gravitational forces of two large bodies, such as the Earth and the Moon, balance the centripetal force felt by a smaller object. This creates a stable location where spacecraft can remain in position with minimal fuel consumption. There are five such points, L1 to L5.