按体积计算,欧女星大约是第六大小行星。它的密度很可能为1.5克/立方厘米,属于典型的C型小行星[4]。2007年,詹姆斯·贝尔(James Baer)和史蒂芬·R·切斯利(Steven R. Chesley)估计欧女星的质量为7019190000000000000♠(1.9±0.4)×1019千克[8]。贝尔最近的一项估算表明其质量为3.27 ×1019千克[9]。
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