Hohmann Transfer Calculator
Hohmann transfer calculator lets you find the best fuel-efficient transfers between two circular orbits.
What Hohmann Transfer Calculator does
The Hohmann Transfer Calculator on Omni Calculator determines the minimum-energy trajectory for moving a spacecraft between two circular orbits. It computes the required changes in velocity (delta-v) at two points along the transfer orbit, the total characteristic energy, and the time of flight. Users can also input rocket parameters like specific impulse and initial mass to calculate the necessary propellant mass. The tool serves as both a practical mission-planning utility and an educational resource, offering linked explanations of orbital mechanics concepts for those unfamiliar with terms like "delta-v" or "Hohmann transfer orbit."
How to use the Omni Calculator Hohmann Transfer Calculator
- 1
Select the mass of the primary body and its gravitational parameter
- 2
Enter the initial orbit radius or altitude
- 3
Enter the destination orbit radius or altitude
- 4
View the calculated delta-v values at the periapsis and apoapsis points
- 5
Review the total delta-v, time of flight, and optional propellant mass requirements
Best for
Astronomy students, amateur space enthusiasts, and preliminary mission designers who need quick calculations of fuel-efficient orbital transfers between circular orbits.
Limitations
- Designed for coplanar circular orbits; inclined or elliptical orbits require additional calculations
- Results assume impulsive burns and idealized conditions
- No unit switching mentioned in the excerpt; inputs and outputs likely use standard astronomical units
Hohmann Transfer Calculator FAQ
- What is a Hohmann transfer and when is it used?
- A Hohmann transfer is an orbital maneuver that uses two engine burns to move a spacecraft between two circular orbits using the least amount of propellant. It is commonly used for transfers between planets, such as from Earth to Mars, or between satellite orbits.
- How is delta-v calculated for a Hohmann transfer?
- Delta-v is calculated as the sum of the velocity changes required at the periapsis and apoapsis of the transfer ellipse to match the target orbit's velocity, representing the minimum impulse needed for the orbital shift.
- Can this calculator determine propellant mass for a real rocket?
- Yes, by entering the engine's specific impulse and the rocket's initial mass, the tool estimates the propellant mass required for the Hohmann transfer maneuver.
- What additional information does the tool provide beyond delta-v?
- The calculator also outputs the time of flight between orbits, the semi-major axis of the transfer ellipse, and links to explanatory articles for users unfamiliar with orbital mechanics terminology.
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