The discovery of Neptune's L5 trojans has been impeded by the fact that they are in a region of space along the line-of-sight to the center of our galaxy, an area of the sky crowded with stars. 2008 LC18 was found in a location where background stars are obscured by a dust cloud. The discovery of one Neptune L5 trojan in a searched area of 19 square degrees suggests that there may be 150 Neptune L5 trojans with a diameter greater than ~80 km (24th magnitude), similar to the estimate of such objects in Neptune's L4 swarm.
2008 LC18 will not be close enough for investigation by the New Horizons spacecraft when it crosses Neptune's L5 region en route to Pluto in 2013–2014, but its discovery shows that other, more accessible Neptune trojans could potentially be found before that time. 2008 LC18 will cross the ecliptic plane in 2011.