385571 Otrera (provisional designation: (385571) 2004 UP10) is a Neptune trojan discovered by Scott S. Sheppard and Chadwick A. Trujillo in 2004. It was the second such body to be discovered. It has the same orbital period as Neptune and orbits at the L4 Lagrangian point about 60 degrees ahead of Neptune. Otrera is the first Neptune Trojan to be named. It is named after the first queen of the Amazons. Otrera was involved with Ares and is the mother of the Amazons queen Penthesilea, who led the Amazons in the Trojan war.