How this calculator works
Enter semi-major axis (au), orbital eccentricity, planet mass (earth = 1), star mass (sun = 1). CalcStack applies the displayed formula and reports each intermediate planning value with the units shown.
Formula / method
Hill radius = a(1−e) × (planet mass ÷ (3 star mass))^(1/3)
Worked example
Use the documented default inputs to model hill sphere.
Assumptions and limitations
Inputs represent stable average operating conditions and the displayed equation applies.
This is a planning model; real systems and measurements can require domain-specific corrections.