Bennett DPUdalski AHan CBond IABeaulieu JPSkowron JGaudi BSKoshimoto NAbe FAsakura YBarry RKBhattacharya ADonachie MEvans PFukui AHirao YItow YLi MCALing CHMasuda KMatsubara YMuraki YNagakane MOhnishi KOyokawa HRanc CRattenbury NJRosenthal MMSaito TSharan ASullivan DJSumi TSuzuki DTristram PJYonehara ASzymański MKPoleski RSoszyński IUlaczyk KWyrzykowskiDepoy DGould APogge RWYee JCAlbrow MDBachelet EBatista VBowens-Rubin RBrillant SCaldwell JARCole ACoutures CDieters SPrester DDDonatowicz JFouqué PHorne KHundertmark MKains NKane SRMarquette JBMenzies JPollard KRRanc CSahu KCWambsganss JWilliams AZub M2018-11-252018-11-2520180004-62561538-3881http://hdl.handle.net/10092/16256© 2018. The American Astronomical Society. All rights reserved. We present the analysis of the microlensing event MOA-2010-BLG-117, and show that the light curve can only be explained by the gravitational lensing of a binary source star system by a star with a Jupiter-mass ratio planet. It was necessary to modify standard microlensing modeling methods to find the correct light curve solution for this binary source, binary-lens event. We are able to measure a strong microlensing parallax signal, which yields the masses of the host star, M∗= 0.58 ±0.11 Mo, and planet, mp= 0.54 ±0.10MJup, at a projected star-planet separation of a = 2.42 ±0.26 au, corresponding to a semimajor axis of a = 2.9-0.6+1.6au. Thus, the system resembles a half-scale model of the Sun-Jupiter system with a half-Jupiter0mass planet orbiting a half-solar-mass star at very roughly half of Jupiter's orbital distance from the Sun. The source stars are slightly evolved, and by requiring them to lie on the same isochrone, we can constrain the source to lie in the near side of the bulge at a distance of DS= 6.9 ±0.7 kpc, which implies a distance to the planetary lens system of DL= 3.5 ±0.4 kpc. The ability to model unusual planetary microlensing events, like this one, will be necessary to extract precise statistical information from the planned large exoplanet microlensing surveys, such as the WFIRST microlensing survey.engravitational lensing: microplanetary systemsJournal Article2018-10-31Fields of Research::51 - Physical sciences::5101 - Astronomical sciences::510104 - Galactic astronomyhttps://doi.org/10.3847/1538-3881/aaadfa