2008 LC18 is a Neptune trojan first observed on 7 June 2008 by American astronomers Scott Sheppard and Chad Trujillo using the Subaru Telescope at Mauna Kea Observatories on Hawaii, United States.
[6] It was the first object found in Neptune's trailing L5 Lagrangian point and measures approximately 100 kilometers in diameter.
These trojans have a semi-major axis and an orbital period very similar to Neptune's (30.10 AU; 164.8 years).
[3] The search for L5 trojans of Neptune has been impeded by the fact that this region of space is currently along the line of sight to the center of the Milky Way, an area of the sky crowded with stars.
[5][6] Based on a generic magnitude-to-diameter conversion, it measures approximately 98 kilometers in diameter using an absolute magnitude of 8.2 with an assumed albedo of 0.10.