"101 Helena is a 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. Radar observations were made of this object on Oct 7 and 19, 2001 from the Arecibo Observatory. Analysis of the data gave an estimated ellipsoidal diameter of 71\u00D763\u00D763 \u00B1 16% km. The diameter estimated from IRAS infrared measurements is 66 km. It is classified as an S-type asteroid in the Tholen system."@en . "101 Helena"@en . . "66384.0"^^ . "3000.0"^^ . "December 31, 2006 (JD2454100.5)" . "83088.0"^^ . "3.31683e+11"^^ . "1.3104e+08"^^ . "173.0"^^ . "125.28"^^ . . "0.1898"^^ . "1868-08-15Z"^^ . "4.41092e+11"^^ . "8.33"^^ . "2000.0"^^ .