## Orbit Calculator

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Circular orbit variables |

**Instructions (Circular Orbit)**

Default values show ISS orbit around Earth. Its average altitude h is 413 km. Orbital speed v is 7.66 km/s and period T is 92.69 min (5561 s). Since ISS specifications agree with the calculator output the calculation is correct (at least for Earth).

Choose the planet that is circulated by the satellite. This will define the planet's radius and mass. Then enter the orbit altitude in meters or the speed in m/s or the period in seconds. Then press any of the three calculate buttons. Any button will calculate 2 unknows using the one parameter given.

**Height units**are m,

**Velocity units**are m/s,

**Altitude units**are m.

The script shows the planet constants used (mass and radius) and results are converted to some more common units also.

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