C/2011 L4 (PANSTARRS) is a non-periodic comet discovered in June 2011 that became visible to the naked eye as it approached perihelion in March 2013.
It was discovered using the Panoramic Survey Telescope and Rapid Response System Pan-STARRS telescope located near the summit of Haleakalā, on the island of Maui in Hawaii.
It originates from the Oort Cloud and its orbital period is millions of years. When C/2011 L4 reached perihelion in March 2013, its peak magnitude was around +1.
Below is a selection of images of the comet captured by BBC Sky at Night Magazine readers and astrophotographers.