# Calculation the affects of the sun, moon and satellite position on the perturbation forces of the low retrograde orbits

### Abstract

The actual position and velocity of the sun and theÂ moon were calculate through one year , and the satellite position and velocity components (x,y,z, v_{x}, v_{y}, v_{z}) were calculate as well as the momentum component at inclination (116.5?) , argument of perigee (30?), longitudeÂ node angle (40?), eccentricity (0.01), for deferent perigee height (200,300,..,1000 km). The acceleration of perturbationsÂ which were calculated in this work are the sun and the moon attraction on the satellite, the solar radiation pressure, the atmospheric drag as well as the earth oblatness. The result show that the perturbation forces of atmospheric drag acceleration is effect by altitude and the sun, moon attraction do not depend on distance from satellite but depend on the angle between (sun earth satellite) and (moon - earth satellite). the earth oblatness acceleration do not depend on altitude of satellite and time, but depend on the position on its orbit and orbital inclination. The solar radiation pressure acceleration is depend on angle (sun - earth satellite) and the minimum value at (180?). Â Â Â Â Â

**Iraqi Journal of Science**, [S.l.], v. 60, n. 4, p. 891-903, may 2019. ISSN 2312-1637. Available at: <http://scbaghdad.edu.iq/eijs/index.php/eijs/article/view/734>. Date accessed: 22 may 2019.