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Calcimator

Orbit Determination Calculator

Orbital elements from position and velocity vectors.

Inputs

Results

Semi-major axis (km)

6,771

Eccentricity

0

Orbital period (min)

92.41

Velocity at perigee (km/s)7.67
Velocity at apogee (km/s)7.67
Circular velocity (km/s)7.67
Specific energy (km²/s²)-29.43
Mean motion (rev/day)15.58
Inclination (deg)51.6
Semi Minor Axis6,771
Specific Ang Momentum51,951.17
Mean Motion0
Nodal Period (min)92.41
How to Use This Calculator
  1. Enter perigee altitude (km) and apogee altitude (km) for your orbit.
  2. Set orbital inclination (degrees) relative to Earth's equatorial plane.
  3. Review semi-major axis, eccentricity, orbital period (min), and velocities at perigee and apogee.
  4. Use apogee velocity to plan Hohmann transfer burns or phasing maneuvers.
  5. Check period against your ground-repeat requirement to confirm the orbit geometry.
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