14827 Hypnos magnitude of 18.65, while infrared radiometry gave a radar albedo of no more than 0.067 and a diameter of at least 740 meters. The "Collaborative Asteroid Lightcurve Link" assumes a standard optical albedo for carbonaceous asteroids 0.057 and derives a diameter of 907 meters with an absolute magnitude of 18.94. The diameter agrees with Tom Gehrels 1994-publication "Hazards due to Comets and Asteroids" in which he estimated a mean-diameter of 900 meters for "Hypnos". This minor planet was named after Hypnos from Greek mythology. He is the god of sleep, son of Nyx and Erebus and twin brother of Thanatos.
Pirene (mythology) Pirene (mythology) In Greek mythology, Pirene or Peirene (Ancient Greek: Πειρήνη means "of the osiers"), a nymph, was either the daughter of the river god Asopus, Laconian king Oebalus, or the River god Achelous, depending on different sources. By Poseidon she became the mother of Lecheas and Cenchrias. When Cenchrias was unintentionally killed by Artemis, Pirene's grief was so profound that she became nothing but tears and turned into the fountain outside the gates of Corinth. The Corinthians had a small sanctuary dedicated to Pirene by the fountain where honey-cakes were offered to her to during the dry months of