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Planetary Gravity Assist Flyby Calculator engineering
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Planetary Gravity Assist Flyby Calculator

Interplanetary astrodynamics: Model hyperbolic gravitational slingshot flybys, hyperbolic eccentricity ($e$), turning deflection angle ($\delta$), impact parameter ($b$), and heliocentric velocity gain ($\Delta V$).

Encounter Planet & Approach Trajectory

Asymptotic entry speed
Closest approach altitude above surface

Gravity Assist Slingshot Output

Hyperbolic Deflection Angle δ:
--
degrees total trajectory bend
Max Heliocentric ΔV Gain:
--
km/s "free" velocity boost
Periapsis Velocity v_p:
--
km/s maximum speed at closest point
Impact Parameter b:
--
km asymptote miss distance
Hyperbolic Eccentricity e: --
Periapsis Radius r_p: --
Gravitational Parameter μ: --
Flyby Mission Benchmark: --

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