$LastChangedDate: 27-Juil-2011 $

# CL_oe_kep2cirEqua

Keplerian to circular equatorial adapted orbital elements

## Calling Sequence

       [cir_equa[,jacob]]=CL_oe_kep2cirEqua(kep)

## Description

- Converts classical keplerian orbital elements to orbital elements adapted to near-circular near-equatorial orbits.

  The transformation jacobian is optionally computed.

  See Orbital elements for more details

## Parameters

kep:

  classical keplerian orbital elements [sma;ecc;inc;pom;raan;anm] [m,rad] (6xN)

cir_equa:

  orbital elements adapted to near-circular near-equatorial orbits [sma;ex;ey;ix;iy;pom+raan+anm] [m,rad] (6xN)

jacob:

  (optional) transformation jacobian d(sma,ecc,inc,pom,raan,anm)/d(sma,ex,ey,ix,iy,pom+raan+anm) (6x6xN)

## Bibliography

- 1) CNES - MSLIB FORTRAN 90, Volume V (mv_kep_cir_equa)

## Authors

- CNES - DCT/SB

## See also

- CL_oe_cirEqua2kep

- CL_oe_kep2car

## Examples

    // Example 1
    kep=[24464560;0.7311;0.122138;3.10686;1.00681;0.048363];
    [cirequa]=CL_oe_kep2cirEqua(kep);

    // Example 2
    kep=[24464560;0.7311;0.122138;3.10686;1.00681;0.048363];
    [cirequa,jacob1]=CL_oe_kep2cirEqua(kep);
    [kep2,jacob2]=CL_oe_cirEqua2kep(cirequa);