The mass of the asteroid (10) Hygiea derived from observations of (829) Academia

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asteroids, Gravitational Effects, Mass Ratios, Orbit Calculation, Planetary Mass, Planetary Orbits, Astronomical Photometry, Density Distribution, Many Body Problem, Mass Distribution, Resonance, Asteroids, Hygiea, Academia, Astronomy, Mass, Celestial Mechanics, Data, Eunomia, Procedure, Earth-Based Observations, Telescope Methods, Ceres, Resonance, Calculations, Orbital Elements, Parameters, Pallas, Vesta

Scientific paper

A systematic search for new mass determinations of asteroids yielded only two promising candidates, (10) Hygiea and (15) Eunomia. Using a close approach between the asteroids Hygiea and Academia of 0.006 AU at a relative velocity of 3.2 km s-1 in 1927, the authors determined a first value for the mass of the fourth largest asteroid Hygiea by analyzing the observations of Academia. Only 43 accurate observations of Academia were available. Some of these observations, in particular the earlier ones were re-reduced. The authors obtained a value of 4.7±2.3×10-11M_sun; for Hygiea which yields a density of 2.05±1 g cm-3 assuming a diameter of 443 km. The large mean error obtained for Hygiea's mass shows the limitations to determine more asteroidal masses.

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