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The aim of this work are to find a Kepler's constant by using polynomialregression of the angular separation \rho = \rho(t) and the position angle\theta = \theta(t). The Kepler's constant obtained is used to derive theelement of orbit. As a case study the angular separation and the position angleof the WDS 00063 +5826 and the WDS 04403-5857 were investigated. Forcalculating the element of orbit the Thiele-Innes van den Bos method is used.The rough data of the angular separation \rho(t) and the position angle\theta(t) are taken from the US Naval Observatory, Washington. This work alsopresents the masses and absolute bolometric magnitudes of each star.These starsinclude into the main-sequence stars with the spectral class G5V forWDS04403-5857and the type of spectrum G3V for WDS 00063+5826. The life time ofthe primary star and the secondary star of WDS 04403-5857 nearly equal to 20Gyr. The life time of the primary star and the secondary star of WDS 00063+5826are 20 Gyr and 19 Gyr, respectively.

Kepler's Constant and WDS Orbit