按體積計算,歐女星大約是第六大小行星。它的密度很可能為1.5克/立方厘米,屬於典型的C型小行星[4]。2007年,詹姆斯·貝爾(James Baer)和史蒂芬·R·切斯利(Steven R. Chesley)估計歐女星的質量為7019190000000000000♠(1.9±0.4)×1019千克[8]。貝爾最近的一項估算表明其質量為3.27 ×1019千克[9]。
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James Baer; Steven Chesley; Robert Matson (編). Astrometric masses of 26 asteroids and observations on asteroid porosity. The Astronomical Journal. 2011, 141 (5) (英語).
Baer, James; Steven R. Chesley. Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris. Celestial Mechanics and Dynamical Astronomy (Springer Science+Business Media B.V. 2007). 2007, 100 (2008): 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8.
Sawyer, Scott Raleigh. A High-Resolution CCD Spectroscopic Survey of Low-Albedo Main Belt Asteroids.. PhD Thesis. 1 January 1991. Bibcode:1991PhDT.......105S –透過NASA ADS.
Gradie, J.; Flynn, L., A Search for Satellites and Dust Belts Around Asteroids: Negative Results, Abstracts of the Lunar and Planetary Science Conference, March 1988, 19: 405–406, Bibcode:1988LPI....19..405G.
Sawyer, S. R. A High-Resolution CCD Spectroscopic Survey of Low-Albedo Main Belt Asteroids PhD thesis (學位論文). The University of Texas.
Schmeer, P., and M. L. Hazen, CV Aquarii identified with (52) Europa, Journal of the American Association of Variable Star Observers, Vol. 28, p. 103 (2000).