Calculadora de Período Orbital PlanetárioFormula

## Planet Orbital Period from Kepler's Law

When the semi-major axis is given in astronomical units and the central star has approximately one solar mass, the period in years is simply the 3/2 power of the axis.

### Formula

**T = a^(3/2) years**

This is the elegant form of Kepler's third law with the Sun's mass baked in.

Exemplo Resolvido

Earth at 1 AU from the Sun.

  1. T = a^(3/2)
  2. T = 1^(3/2) = 1 year
  3. T = 365.25 days