Neptune trojan

[6] Neptune's trailing L5 region is currently very difficult to observe because it is along the line of sight to the center of the Milky Way, an area of the sky crowded with stars.

[6] It was discovered by a dedicated survey that scanned regions where the light from the stars near the Galactic Center is obscured by dust clouds.

It would have been possible for the New Horizons spacecraft to investigate L5 Neptune trojans discovered by 2014, when it passed through this region of space en route to Pluto.

[5] Some of the patches where the light from the Galactic Center is obscured by dust clouds are along New Horizons's flight path, allowing detection of objects that the spacecraft could image.

[8] However, New Horizons may not have had sufficient downlink bandwidth, so it was eventually decided to give precedence to the preparations for the Pluto flyby.

[11] The existence of high-inclination Neptune trojans points to a capture during planetary migration instead of in situ or collisional formation.

This results in repeated perturbations that increase the libration of existing trojans causing their orbits to become unstable.

[2] This is similar to the colors of the blue lobe of the centaur color distribution, the Jupiter trojans, the irregular satellites of the gas giants, and possibly the comets, which is consistent with a similar origin of these populations of small Solar System bodies.

[2] Several Neptunian Trojans have been observed to have very-red colors similar to cold classical Kuiper belt objects.

It is constructed from the list of Neptune trojans maintained by the IAU Minor Planet Center[1] and with diameters from Sheppard and Trujillo's paper on 2008 LC18,[7] unless otherwise noted.