| dimensions=500×385×350 km <ref name="Kaasalainen2002">M. Kaasalainen et al [http://www.rni.helsinki.fi/~mjk/IcarPIII.pdf ''Models of Twenty Asteroids from Photometric Data''], Icarus, Vol. 159, p. 369 (2002). </ref>
| mass=8,6 ± 0,7 · 10<sup>{{e|19</sup>}} [[kilogram|kg]] <ref name="Chesley2005">S. R. Chesley et al [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005DDA....36.0505C&db_key=AST&data_type=HTML&format=&high=444b66a47d20810 ''The Mass of Asteroid 10 Hygiea''], abstract for American Astronomical Society, DDA meeting #36, #05.05 (2005) (on ADS). </ref><ref name="Michalak2001">G. Michalak [http://www.aanda.org/articles/aa/pdf/2001/29/aa10228.pdf?access=ok ''Determination of asteroid masses''], Astronomy & Astrophysics, Vol. 374, 703 (2001). </ref><ref name="Chernetenko05">Yu. Chernetenko, O. Kochetova, and V. Shor [http://www.ipa.nw.ru/PAGE/DEPFUND/LSBSS/engmasses.htm Masses and densities of minor planets] Update 1 Sept. 2005. (webpage) </ref>
