The second Jupiter Trojan to be found (first trailing Trojan found), in 1906. The only binary Trojan asteroid, with a companion Menoetius. They have similar masses and orbit a common center (122 km and 112 km at 680 km apart from the common center). The pairs's masses and densities were able to be computed, and found to be much less than normal asteroids, and more like comets. It is speculated that they (and perhaps all Jupiter Trojans) originated from the Kuiper Belt, perhaps captured by Jupiter when it was closer to the Sun.