71P/Clark is a periodic comet in the Solar System with an orbital period of 5.5 years. It was discovered by Michael Clark at Mount John University Observatory, New Zealand on 9 June 1973 with a brightness of apparent magnitude 13. Subsequently it has been observed in 1978, 1984, 1989, 1995, 2000, 2006, 2011 and 2017. See also List of numbered comets References External links Orbital simulation from JPL (Java) / Horizons Ephemeris 71P/Clark – Seiichi Yoshida @ aerith.net Periodic comets 0071 Comets in 2011 Comets in 2017 19730609