DELTA-SIERRA MARS TOOL
Earth–Mars Hohmann transfer calculator
Understand transfer time and velocity differences in a two-body model.
Essential answer
A Hohmann transfer is an ideal ellipse tangent to two circular orbits. For Earth–Mars, the trip is one half of the transfer ellipse.
Every value is editable. Scenario values are not an official NASA architecture.
Calculator
Method and limitations
The model assumes circular coplanar orbits and ignores ephemerides, inclination, spheres of influence, launch, capture, and corrections. It is for understanding an order of magnitude, not for mission navigation.
Primary sources and evidence status
The calculation distinguishes physical relation, demonstrated value, standard, educational assumption, and Delta-Sierra scenario.
- NASA Science — Basics of Space Flight: Trajectories
Explains Hohmann transfer orbits as an idealized minimum-propellant interplanetary model. - JPL Solar System Dynamics — Astrodynamic Parameters
Reference heliocentric GM; the tool uses a simplified circular-orbit model, not mission ephemerides.
Sources and further reading
Downloadable scenario data
Dataset v1.1 documents every prefilled value: unit, system boundary, time basis, evidence status, and source when one exists.