1870 Glaukos, provisional designation 1971 FE, is a carbonaceous Jupiter trojan, approximately 40 kilometers in diameter. It was by discovered by Cornelis van Houten and I. van Houten-Groeneveld at Leiden, on photographic plates taken by Tom Gehrels at the Californian Palomar Observatory, United States on 24 March 1971. The Trojan asteroid with a C-type spectra orbits the Sun at a distance of 5.1–5.4 AU once every 12 years (4,392 days). It has an assumed albedo of 0.057 and takes 5.9 hours to rotate around its axis. More than 6,200 Jupiter trojans have already been discovered.