Orbital Period Calculator
Calculate orbital period using Kepler's laws. Find orbital velocity, angular velocity, and perihelion/aphelion distances.
Inputs
AU
Solar Masses
Results
Orbital Period
1 years
Orbital Period
365.25 days
Orbital Velocity
29,785.68 m/s
Angular Velocity0.017202 rad/day
Perihelion Distance1 AU
Aphelion Distance1 AU
How to Use This Calculator
- Enter the Semi-Major Axis (AU) of the orbit β Earth's is 1 AU, Mars is 1.524 AU.
- Enter the Central Mass (solar masses) of the star or body being orbited β the Sun is 1 Mβ.
- Set Orbital Eccentricity (0β0.99): 0 is circular, Earth's is 0.017, Pluto's is 0.25.
- Read Orbital Period (years and days), Mean Orbital Velocity (m/s), and Perihelion/Aphelion distances (AU).
- Use the orbital period to plan observation timing or to verify radial velocity measurements.
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Formula
TΒ² = (4ΟΒ² / GM) Γ aΒ³ (Kepler's Third Law)Related Calculators
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