CL_ip_flybyParams

Description

• Given two fly-by parameters, the function computes other ones.

  The available fly-by parameters are:

  - vinf: hyperbolic excess velocity

  - rp: Radius at periapsis

  - dinf: Impact parameter = distance from the body center to the asymptote of the hyperbola

  - turnang: Fly-by turn-angle = angle between arrival departure excess velocity vectors

  - vp: Velocity at periapsis

  - dv: Norm of velocity increment

  

• Note:

  In the current version:

  - The 1st input parameter must be "vinf"

  - The 2nd input parameter must be "rp", "dinf" or "turnang"

Parameters

type_par1:

(string) Type of 1st input parameter. Only "vinf" accepted. (1x1)

par1:

Value of 1st input parameter [m, m/s, rad]. (1xN or 1x1)

type_par2:

(string) Type of 2nd input parameter: "rp", "dinf" or "turnang". (1x1)

par2:

Value of 2nd input parameter [m, m/s, rad]. (1xN or 1x1)

output:

(string) Names of the desired output parameters: "vinf", "rp", "dinf", "turnang", "vp" or "dv". (1xP)

mu:

(optional) Gravitational constant [m^3/s^2]. Default value is %CL_mu.

par_out1, par_out2, ...:

Values of the output parameters [m, m/s, rad]. (1xN)

Authors

• CNES - DCT/SB

See also

• CL_ip_flybyVectors

Bibliography

• H.D. Curtis, Orbital Mechanics for Engineering Students, ch. 8.

Examples

// Periapsis radius (m) and hyperbolic excess velocity (m/s) rp = 8.e6; vinf = 3.e3; // Flyby turn-angle (default value for "mu") turnang = CL_ip_flybyParams("vinf", vinf, "rp", rp, "turnang") // Check results CL_ip_flybyParams("vinf", vinf, "turnang", turnang, "rp") - rp // => 0