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We acquired differential UBV photoelectric photometry and radial velocities of the relatively bright, understudied, massive Algol binary ET Tau and utilized the Wilson-Devinney (WD) analysis program to obtain a simultaneous solution of these observations. To improve the orbital ephemeris, the V measurements from the ASAS program were also analyzed. Because of the very rapid rotation of the significantly more massive and hotter component (B2/3 spectral class), only radial velocities of the secondary component, which has a ~B7 spectral class, could be measured. We derive masses of and and equal-volume radii of and for the primary and secondary, respectively. The secondary is filling its Roche lobe, so the system is semi-detached. The effective temperature of the secondary was held fixed at 15,000 K, and the primary's temperature was found to be K. The system, which has a period of 5.996883 ± 0.2 days, is assumed to have a circular orbit and is seen at an inclination of .

Orbital Solutions and Absolute Elements of the Massive Algol Binary ET Tauri