Nereid

With a diameter of 360 kilometers, it is easy to observe, and was the 2nd moon of Neptune found. It also has a very eccentric orbit and orbits quite far from neptune. Despite it having a diameter of 360 kilometers, it isn't a sphere.

Discovery and name
Nereid was discovered by Gerard Kuiper on 1 May 1949 using photos from a 82-inch telescope at McDonald Observatory. The moon is named after the Nereids, sea-nymphs of Greek mythology and attendants of the god Neptune. It was the second and last moon of Neptune to be discovered before the arrival of Voyager 2 (not counting a single observation of an occultation by Larissa in 1981).