Orbital Velocity Calculator
Calculate the orbital velocity required for any celestial body to maintain a stable orbit around a planet or star
Calculate Orbital Velocity
Orbital Velocity
For Earth Orbit
7.78 km/s
Orbital Period
92.8 min
Orbit Type
Low Earth Orbit
Orbital Velocity Explained
Formula
Where:
- v = Orbital velocity (m/s)
- G = Gravitational constant (6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²)
- M = Mass of the central body (kg)
- r = Distance from the center of the central body to the orbiting object (m)
Orbital velocity is the speed at which an object must travel to maintain a stable orbit around a celestial body. This velocity balances the gravitational pull of the central body with the centrifugal force of the orbiting object.
Key Concepts
- Circular Orbit: For a perfectly circular orbit, the orbital velocity is constant at all points in the orbit.
- Altitude Effect: Higher orbits require lower orbital velocities. For example, satellites in geostationary orbit travel slower than those in low Earth orbit.
- Mass Effect: Heavier celestial bodies require higher orbital velocities at the same distance.
- Escape Velocity: Approximately √2 times the orbital velocity at that altitude.
Frequently Asked Questions
Orbital velocity is the minimum speed an object needs to maintain a stable orbit around a celestial body. It’s the speed at which the gravitational pull of the central body is balanced by the object’s inertia, creating a stable circular path.
As altitude increases, orbital velocity decreases. For example, satellites in low Earth orbit (LEO) at about 200 km altitude travel at approximately 7.8 km/s, while geostationary satellites at 35,786 km altitude travel at about 3.07 km/s.
Orbital velocity is the speed required to maintain an orbit, while escape velocity is the minimum speed needed to completely break free from a celestial body’s gravitational pull. Escape velocity is approximately √2 times the orbital velocity at the same altitude.
Objects in orbit experience “weightlessness” because they are in continuous free fall toward Earth. Their forward motion causes them to continually miss the Earth, creating the sensation of weightlessness while still being subject to gravity.