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We have obtained optical and infrared photometry of the quiescent soft X-raytransient XTE J1118+480. In addition to optical and J-band variations, wepresent the first observed H- and K_s-band ellipsoidal variations for thissystem. We model the variations in all bands simultaneously with the WD98 lightcurve modeling code. The infrared colors of the secondary star in this systemare consistent with a K7V, while there is evidence for light from the accretiondisk in the optical. Combining the models with the observed spectral energydistribution of the system, the most likely value for the orbital inclinationangle is 68 +/- 2 deg. This inclination angle corresponds to a primary blackhole mass of 8.53 +/- 0.60 M_sun. Based on the derived physical parameters andinfrared colors of the system, we determine a distance of 1.72 +/- 0.10 kpc toXTE J1118+480.Comment: 6 pages, 3 figures, To appear in ApJ 01 May 2006 issu

The Inclination Angle and Mass of the Black Hole in XTE J1118+480