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Both calculators run independently — change the inputs on either side to compare results.

Orbital Velocity Calculator

Compute the orbital velocity around a central body using v = √(GM/r) × √(1+e), an approximation that scales the circular-orbit speed by the eccentricity. Useful for first-order estimates of satellite velocities, planetary orbital speeds, and binary star systems.

Central Body Mass (kg)

Orbital Radius (meters)

Orbital Eccentricity

Astronomy

Distance Modulus Calculator

Compute distance to a celestial object in parsecs from its apparent and absolute magnitudes using the distance modulus formula d = 10^((m − M + 5)/5). The standard "standard candle" technique for measuring distances across the Milky Way and to nearby galaxies.

Apparent Magnitude (mag)

Absolute Magnitude (mag)

Key differences

	Orbital Velocity Calculator	Distance Modulus Calculator
Category	Astronomy	Astronomy
Inputs required	3	2
Result	Orbital Velocity (m/s)	Distance (parsecs)
What it does	Compute the orbital velocity around a central body using v = √(GM/r) × √(1+e), an approximation that scales the circular-orbit speed by the eccentricity. Useful for first-order estimates of satellite velocities, planetary orbital speeds, and binary star systems.	Compute distance to a celestial object in parsecs from its apparent and absolute magnitudes using the distance modulus formula d = 10^((m − M + 5)/5). The standard "standard candle" technique for measuring distances across the Milky Way and to nearby galaxies.