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In this paper, the first complete photometric light curves in the B, V, and Rpassbands for an eclipsing binary LO Com are presented, and the photometricsolution for the LO Com is derived by analyzing these light curves by using theWilson and Devinney code. From the photometric solution, it is found that theLO Com is a W-type W UMa binary with a mass ratio of q={m}2/{m}1=2.478 and acontact degree of f=(3.2+/- 0.25) % . By combining the two new minimum timeswith those published earlier in the literature, we have found that the (O - C)curve shows a downward parabolic variation corresponding to a long-termdecrease in the orbital period with a rate of {d}P/{d}t=-1.18*{10}-7 days yr-1.This long-term decrease in its orbital period may be caused by mass transferfrom the more massive component to the less massive one.

The First Photometric Study of the Short-period Shallow Contact System LO Comae