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We present the analysis result of a gravitational binary-lensing eventOGLE-2005-BLG-018. The light curve of the event is characterized by 2 adjacentstrong features and a single weak feature separated from the strong features.The light curve exhibits noticeable deviations from the best-fit model based onstandard binary parameters. To explain the deviation, we test models includingvarious higher-order effects of the motions of the observer, source, and lens.From this, we find that it is necessary to account for the orbital motion ofthe lens in describing the light curve. From modeling of the light curveconsidering the parallax effect and Keplerian orbital motion, we are able tomeasure not only the physical parameters but also a complete orbital solutionof the lens system. It is found that the event was produced by a binary lenslocated in the Galactic bulge with a distance $6.7\pm 0.3$ kpc from the Earth.The individual lens components with masses $0.9\pm 0.3\ M_\odot$ and $0.5\pm0.1\ M_\odot$ are separated with a semi-major axis of $a=2.5 \pm 1.0$ AU andorbiting each other with a period $P=3.1 \pm 1.3$ yr. The event demonstratesthat it is possible to extract detailed information about binary lens systemsfrom well-resolved lensing light curves.

OGLE-2005-BLG-018: Characterization of Full Physical and Orbital Parameters of a Gravitational Binary Lens