101_helena | epoch | 2006-12-31 <tsp> 101_helena | mass | 30 (kilograms) <tsp> 101_helena | orbitalperiod | 15166700000000003 (days) <tsp> 101_helena | apoapsis | 4410920000 (kilometres) <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 
101 helena has an orbit of 1516.6700000000003 days and an apoapsis of 441092000.0 kilometres. the epoch date is 31 december 2006 and it has a mass of 3 kgs.no information