Name

CL_op_rpvp2ae — Periapsis radius and velocity at periapsis to semi major axis and eccentricity

Calling Sequence

   [sma,ecc] = CL_op_rpvp2ae(rp,vp[,mu])
   
   

Description

  • Computes keplerian parameters semi major axis and eccentricity from periapsis radius and velocity at periapsis (elliptic and hyperbolic orbits).
  • Last update : 20/2/2008

Parameters

rp:

periapsis radius [m] (1xN)

vp:

velocity at periapsis [m/s] (1xN)

mu :

(optionnal) geocentric gravitational constant [m^3/s^2] (default value is %CL_mu)

sma:

semi major axis [m] (1xN)

ecc:

eccentricity (1xN)

Authors

CNES - DCT/SB

Examples

// Elliptic orbit
rp = 7078.e3;
vp = 8.e3;
[sma,ecc] = CL_op_rpvp2ae(rp,vp)

// Hyperbolic orbit
rp = 7078.e3;
vp = 12.e3;
[sma,ecc] = CL_op_rpvp2ae(rp,vp)