C/2011 L4 (PANSTARRS) is a non-periodic comet. It was discovered using the Pan-STARRS telescope located near the summit of Haleakalā, on the island of Maui in Hawaii, on June 2011. It became visible to the naked eye when it was near perihelion in March 2013. Comet C/2011 L4 probably took millions of years to come from the Oort cloud. After leaving the planetary region of the Solar System, the post-perihelion orbital period (epoch 2050) is estimated to be roughly 106000 years. Dust and gas production suggests the comet nucleus is roughly 1 kilometer in diameter. This three panel mosaic shows the comet near Messier 31 (Andromeda Galaxy).