[1] The relatively bright and possibly elongated Jovian asteroid belongs to the 40 largest Jupiter trojans and has a rotation period of 12.3 hours.

[18] As the existence of this family is not well established, Ennomos is still considered part of the Jovian background population by another HCM-analysis (Knezevic and Milan).

[4] In December 1990, a rotational lightcurve of Ennomos was obtained by Italian astronomers Stefano Mottola and Mario Di Martino using the 1.52-meter Loiano Telescope at the Observatory of Bologna in Italy.

Lightcurve analysis gave a well-defined rotation period of 12.275 hours with a relatively high brightness amplitude of 0.47 magnitude (U=3), indicative of a non-spherical, elongated shape.

[4][15] Between 2015 and 2017, photometric observations by Daniel Coley and Robert Stephens at the Center for Solar System Studies, California, gave several concurring periods of 12.267, 12.269 and 12.271 with an amplitude between 0.43 and 0.46 magnitude (U=3/3/3).

[8][9][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0972 and a diameter of 81.23 kilometers based on an absolute magnitude of 8.6.