101_helena | epoch | 2006-12-31 <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 epoch of 2006-12-31 an orbital period of 1516.6700000000003 days and its apoapsis is 441092000.0 (kilometres).no information