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MOST time-series photometry of mu Eri, an SB1 eclipsing binary with arapidly-rotating SPB primary, is reported and analyzed. The analysis yields anumber of sinusoidal terms, mainly due to the intrinsic variation of theprimary, and the eclipse light-curve. New radial-velocity observations arepresented and used to compute parameters of a spectroscopic orbit. Frequencyanalysis of the radial-velocity residuals from the spectroscopic orbitalsolution fails to uncover periodic variations with amplitudes greater than 2km/s. A Rossiter-McLaughlin anomaly is detected from observations coveringingress.  From archival photometric indices and the revised Hipparcos parallax wederive the primary's effective temperature, surface gravity, bolometriccorrection, and the luminosity. An analysis of a high signal-to-noisespectrogram yields the effective temperature and surface gravity in goodagreement with the photometric values. From the same spectrogram, we determinethe abundance of He, C, N, O, Ne, Mg, Al, Si, P, S, Cl, and Fe.  The eclipse light-curve is solved by means of EBOP. For a range of mass ofthe primary, a value of mean density, very nearly independent of assumed mass,is computed from the parameters of the system. Contrary to a recent report,this value is approximately equal to the mean density obtained from the star'seffective temperature and luminosity.  Despite limited frequency resolution of the MOST data, we were able torecover the closely-spaced SPB frequency quadruplet discovered from the groundin 2002-2004. The other two SPB terms seen from the ground were also recovered.Moreover, our analysis of the MOST data adds 15 low-amplitude SPB terms withfrequencies ranging from 0.109 c/d to 2.786 c/d.

mu Eridani from MOST and from the ground: an orbit, the SPB component's fundamental parameters, and the SPB frequencies