Name

CL_gm_raan2beta — Right ascension of ascending node to beta angle

Calling Sequence

   [betaa] = CL_gm_raan2beta(inc,raan,alpha_sun,delta_sun)
   
   

Description

  • Computes the beta angle (betaa) (angle between the satellite's orbital plane and the Sun) from raan (right ascension of the orbit's ascending node), alpha_sun (sun's right ascension), delta_sun (sun's declination) and inc (orbit's inclination).

    Note : if beta is positive then the sun is in the same direction as the kinetic momentum

  • Last update : 19/5/2008

Parameters

inc:

orbit's inclination [rad] (1xN)

raan:

right ascension of the orbit's ascending node [rad] (1xN)

alpha_sun:

right ascension of the sun [rad] (1xN)

delta_sun:

sun declination [rad] (1xN)

betaa:

beta angle [rad] (1xN)

See also

CL_op_locTime, CL_gm_beta2raan, CL_mod_moonSunG50

Authors

CNES - DCT/SB

Examples

// Get alpha_sun and delta_sun
cjd = 20050;
[r_sun,rs] = CL_mod_moonSunG50(cjd,'s');
r_sph = CL_co_car2sph(r_sun);
alpha_sun = r_sph(1);
delta_sun = r_sph(2);
raan = %pi/4;
inc = CL_deg2rad(98.7);
betaa = CL_gm_raan2beta(inc,raan,alpha_sun,delta_sun)