Calculadora de Excentricidade Orbital — Formula

Orbital Eccentricity

Eccentricity describes how elongated an orbit is (0 = circle, approaching 1 = very elongated ellipse).

Formula

e = (r_a - r_p) / (r_a + r_p)

Semi-major axis: a = (r_a + r_p) / 2

Exemplo Resolvido

Earth: perihelion 147.1M km, aphelion 152.1M km.

  1. e = (152.1M - 147.1M) / (152.1M + 147.1M)
  2. e = 5M / 299.2M ≈ 0.01672
  3. a = 299.2M / 2 = 149.6M km