  Accurate measurements of osculating orbital elements are essential in order
to understand and model the complex dynamic behavior of Near Earth Asteroids
(NEAs). ESA's Gaia mission promises to have great potential in this respect. In
this article we investigate the prospects of constraining orbits of newly
discovered and known NEAs using nearly simultaneous observations from the Earth
and Gaia. We find that observations performed simultaneously from two sites can
effectively constrain preliminary orbits derived via statistical ranging. By
linking discoveries stored in the Minor Planet Center databases to Gaia
astrometric alerts one can identify nearly simultaneous observations of Near
Earth Objects and benefit from improved initial orbit solutions at no
additional observational cost.
