71P/Clark

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.

The nucleus of the comet has a radius of 0.68 ± 0.04 kilometers, assuming a geometric albedo of 0.04, based on observations by Hubble Space Telescope, while observations by Keck indicate a radius of 1.305 km.