It was discovered on 19 September 1973, by Dutch astronomers Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California.
[1] The likely spherical Jovian asteroid is the principal body of the proposed Euryalos family and has a rotation period of 6.4 hours.
It is located in the leading Greek camp at the Gas Giant's L4 Lagrangian point, 60° ahead on its orbit (see Trojans in astronomy).
[7] In August 1995, a rotational lightcurve of Euryalos was obtained from photometric observations over four nights by Italian astronomer Stefano Mottola using the Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile.
Lightcurve analysis gave a well-defined rotation period of 6.391±0.005 hours with a low brightness amplitude of 0.07 magnitude (U=2), indicative of a spherical rather than elongated shape.