Aerobraking Campaign: Walking Down an Orbit with…

What Aerobraking Is

Aerobraking is a maneuver used by spacecraft to reduce their altitude or change the shape of their orbit around a planet with an atmosphere. It involves dipping into the upper layers of the target planet's atmosphere at specific points in the orbit, where atmospheric drag slows down the spacecraft.

This method is particularly useful for missions aiming to reach low-altitude orbits without carrying excessive amounts of propellant, which would be required for traditional propulsion methods.

How Aerobraking Works

During an aerobraking maneuver, the spacecraft is brought close enough to the planet’s atmosphere to experience significant atmospheric drag. This drag exerts a force opposite to the direction of motion, causing the spacecraft to lose speed and enter into a lower orbit or change its orbital parameters.

The process involves multiple passes through the atmosphere at specific points in the orbit (periapsis), where the spacecraft is slowed down by friction with the air molecules. This repeated exposure to atmospheric drag gradually lowers the apoapsis of the orbit, bringing the spacecraft closer to the planet.

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Why It Matters

Aerobraking significantly reduces the amount of propellant needed for a mission, making it more cost-effective and reducing the launch mass. This is crucial for deep space missions where every kilogram counts.

Moreover, aerobraking allows spacecraft to achieve precise orbits that are difficult or impossible to reach with conventional propulsion methods alone.

Real-World Examples

The Mars Reconnaissance Orbiter and the Mars Global Surveyor both used aerobraking techniques to enter their science orbits around Mars. These missions demonstrated the effectiveness of aerobraking in achieving precise, low-altitude orbits without needing large amounts of propellant.

Aerobraking has also been employed by other planetary missions such as the Cassini-Huygens mission to Saturn and the Juno mission to Jupiter, showcasing its versatility across different planetary environments.

Frequently asked questions

How does aerobraking differ from traditional propulsion methods?

Aerobraking uses atmospheric drag for deceleration, whereas traditional propulsion methods rely on onboard fuel and engines to change the spacecraft's velocity.

What are the risks associated with aerobraking?

Risks include potential damage from excessive heating due to high-speed entry into the atmosphere and the possibility of not achieving the desired orbit if the atmospheric conditions differ significantly from predictions.

Can aerobraking be used on any planet with an atmosphere?

Aerobraking is most effective for planets with substantial atmospheres, such as Mars or Saturn. It may not work efficiently on smaller bodies like the Moon or asteroids due to their thinner atmospheres.

Is aerobraking a new technique in space exploration?

Aerobraking has been used since the 1970s, with its first successful application being the Viking program's orbiters around Mars. It has since become a standard technique for many interplanetary missions.

Try it live

Everything above runs in your browser — open Aerobraking Campaign — Walking Down an Orbit with Atmospheric Drag and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Aerobraking Campaign — Walking Down an Orbit with Atmospheric Drag simulation

Aerobraking Campaign: Walking Down an Orbit with Atmospheric Drag