Calcolatore Eccentricita Orbitale — 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**
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**
Esempio Risolto
Earth: perihelion 147.1M km, aphelion 152.1M km.
- e = (152.1M - 147.1M) / (152.1M + 147.1M)
- e = 5M / 299.2M ≈ 0.01672
- a = 299.2M / 2 = 149.6M km