2004 KV18
Orbit and classification. Neptune trojans are resonant trans-Neptunian objects (TNO) in a mean-motion orbital resonance with Neptune. These Trojans have a semi-major axis and an orbital period very similar to Neptune's (30.10 AU; 164.8 years). Orbital instability. is not a primordial Neptune trojan, and will leave the region on a relatively short time scale. The orbit of a Neptune trojan can only be stable when the eccentricity is less than 0.12. Its lifetime as a trailing Neptune trojan is on the order of 100,000 years into the future. Physical properties. Diameter and albedo. Based  on a generic magnitude-to-diameter conversion, it measures approximately 71 kilometers in diameter using an absolute magnitude of 8.9 and an assumed albedo of 0.10. It is one of the smaller bodies among the first 17 Neptune trojans discovered so far, which measure between 60 and 200 kilometers (for an absolute magnitude of 9.3–6.6 and an assumed albedo of 0.10). Other estimates, implying a higher albedo than 0.10, gave a diameter of approximately 56 kilometers. Numbering and naming. Due to its orbital uncertainty, this minor planet has not been numbered and its official discoverers have not been determined. If  named, it will follow the naming scheme already established with 385571 Otrera, which is to name these objects after figures related to the Amazons, an all-female warrior tribe that fought in the Trojan War on the side of the Trojans against the Greek.