Editing 433 Eros (section)

===Later studies===
During the opposition of 1900–1901, a worldwide program was launched to make [[parallax]] measurements of Eros to determine the [[solar parallax]] (or distance to the Sun), with the results published in 1910 by [[Arthur Hinks]] of [[Cambridge]]<ref name=Hinks-1909/> and [[Charles D. Perrine]] of the [[Lick Observatory]], [[University of California]].<ref name="Perrine1910" /> Perrine published progress reports in 1906<ref name=Perrine1906/> and 1908.<ref name=Perrine1908/> He took 965&nbsp;photographs with the [[Crossley Reflector]] and selected 525 for measurement.<ref name=Campbell-1906/> A similar program was then carried out, during a closer approach, in 1930–1931 by [[Harold Spencer Jones]].<ref name=Jones-1941/> The value of the [[Astronomical Unit]] (roughly the Earth-Sun distance) obtained by this program was considered definitive until 1968, when [[radar]] and [[dynamical parallax]] methods started producing more precise measurements.

Eros was the first asteroid detected by the [[Arecibo Observatory]]'s radar system.<ref name=Butrica-1996/><ref name="AsteroidRadarAstronomy"/>

Eros was one of the first asteroids visited by a spacecraft, the first one orbited, and the first one soft-landed on. [[NASA]] spacecraft [[NEAR Shoemaker]] entered orbit around Eros in 2000, and landed in 2001.