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Stellar companion of a black hole orbiting in an eccentric orbit willexperience modulating tidal force with a periodicity same as that of theorbital period. This, in turn, would modulate accretion rates, and the seedphoton flux which are inverse Comptonized to produce harder X-rays. Byanalyzing complete all sky monitor (ASM) data (1.5-12 keV) of RXTE and all skysurvey data (15-50 keV) of Swift/BAT we discover this periodicity in severalobjects. We also estimate eccentricities from the RMS power of the peak aroundquasi-orbital periods (QOP). Our method provides an independent way to obtaintime periods and eccentricities of such compact binaries.

Periodic X-ray Modulation and its relation with orbital elements in Compact Binaries