101_helena | discoverer | james_craig_watson <tsp> 101_helena | orbitalperiod | 15166700000000003 (days) <tsp> james_craig_watson | nationality | canada <tsp> james_craig_watson | deathplace | madison,_wisconsin <sep> helena (minor planet designation: 101 helena) is a large, rocky main-belt asteroid it was discovered by canadian-american astronomer j c watson on august 15, 1868, and was named after helen of troy in greek mythology this object is orbiting the sun with a period of 416 years and an eccentricity of 014 
canadian. james craig watson (died in madison. wisconsin). discovered 101 helena. which has an orbit of 1516.6700000000003 days.helena was discovered by canadian-american astronomer j. c. watson in 1868