 SL9 is not unique in having orbited Jupiter for a time ; five comets , ( including <unk> / <unk> , <unk> / Kushida – Muramatsu , and 111P / Helin – Roman – Crockett ) are known to have been temporarily captured by the planet . Cometary orbits around Jupiter are unstable , as they will be highly elliptical and likely to be strongly perturbed by the Sun 's gravity at <unk> ( the furthest point on the orbit from the planet ) . 
