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The lens system exhibits two images of a $z = 2.89$ quasar, with an image separation of $1{\\farcs}832 \\pm 0.007$ . Near-IR imaging of the system reveals the presence of the lensing galaxy between the two quasar images. Based on absorption features seen in the Sloan Digital Sky Survey (SDSS) spectrum, we determine a lens galaxy redshift of $z = 0.1756$. 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Eisenstein, David E. Johnston, Donald G. York, Donald P. Schneider, Edwin L. Turner, Gordon T. Richards, Jon Brinkmann, Joshua A. Frieman, Maki Sekiguchi, Michael D. Gregg, Naohisa Inada, Robert H. Becker, Ryan Scraton, Scott Burles","submitted_at":"2003-12-05T23:45:06Z","abstract_excerpt":"We report the discovery of SDSSJ115517.35+634622.0, a previously unknown gravitationally lensed quasar. The lens system exhibits two images of a $z = 2.89$ quasar, with an image separation of $1{\\farcs}832 \\pm 0.007$ . Near-IR imaging of the system reveals the presence of the lensing galaxy between the two quasar images. Based on absorption features seen in the Sloan Digital Sky Survey (SDSS) spectrum, we determine a lens galaxy redshift of $z = 0.1756$. 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