$LastChangedDate: 27-Juil-2011 $

# CL_oe_cirEqua2kep

Circular equatorial adapted to keplerian orbital elements

## Calling Sequence

       [kep[,jacob]]=CL_oe_cirEqua2kep(cir_equa)

## Description

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

  The transformation jacobian is optionally computed.

  See Orbital elements for more details

## Parameters

cir_equa:

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

kep:

  classical keplerian orbital elements [sma;ecc;inc;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_cir_equa_kep)

## Authors

- CNES - DCT/SB

## See also

- CL_oe_kep2cirEqua

- CL_oe_cirEqua2car

## Examples

    // Example 1
    cirequa = [42166.712;-7.900e-6;1.100e-4;1.200e-4;-1.16e-4;5.300];
    [kep,jacob1]=CL_oe_cirEqua2kep(cirequa);
    [cirequa2,jacob2]=CL_oe_kep2cirEqua(kep);