Vis-viva Calculator
Compute orbital speed v = √[μ(2/r − 1/a)].
Input Data
Input Grav. parameter μ.
m³/s²
Input Current radius r.
m
Input Semi-major axis a.
m
Results
7,546.05m/s
v = √[μ(2/r − 1/a)] = 7546.05 m/s
At a glance:Vis-viva Calculator: enter parameters to compute results; complements related calculators.
Formula
v² = μ (2/r − 1/a)
circular orbit r=a gives v=√(μ/r)
How to Use
- Enter gravitational parameter μ.
- Enter current radius r and semi-major axis a.
- Get orbital speed v.
Case Studies
Circular r=a=7000 km
v = √(3.986e14/7e6) ≈ 7546 m/s.
FAQ
What is μ?
μ = GM; Earth ≈ 3.986×10¹⁴ m³/s².
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.