22149 Cinyras (provisional designation ) is a Jupiter trojan asteroid from the Greek camp, approximately in diameter. It was discovered on 21 November 2000, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Lab's ETS near Socorro, New Mexico, in the United States. The dark Jovian asteroid belongs to the largest Jupiter trojans and has a rotation period of 7.84 hours.
Cinyras is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's Lagrangian point, 60ð ahead of its orbit . It is also a non-family asteroid in the Jovian background population. It orbits the Sun at a distance of 4.9âÂÂ5.4 AU once every 11 years and 9 months (4,280 days; semi-major axis of 5.16 AU). Its orbit has an eccentricity of 0.05 and an inclination of 21ð with respect to the ecliptic. The body's observation arc begins with its first observation as at the La Silla Observatory in July 1994, more than 6 years prior to its official discovery observation at Socorro.
This minor planet was numbered by the Minor Planet Center on 8 February 2001 (). It was named in April 2025 after Cinyras, a ruler of Cyprus who gifted Agamemnon his armor.
Cinyras is an assumed carbonaceous C-type asteroid. Most Jupiter trojans are D-types, with the remainder being mostly C and P-type asteroids. It has a high VâÂÂI color index of 1.090.
In July 2006, the first rotational lightcurve of Cinyras was obtained from photometric observations by Italian amateur astronomer Silvano Casulli. Lightcurve analysis gave a rotation period of hours with a brightness amplitude of 0.20 magnitude ().
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, Cinyras measures 48.19 and 50.37 kilometers in diameter and its surface has an albedo of 0.063 and 0.076, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 50.77 kilometers based on an absolute magnitude of 10.2.