Supriya Ghosh (Editor)

101 Helena

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Discovered by  James Craig Watson
Minor planet category  Main belt
Discovered  15 August 1868
Spectral type  S-type asteroid
Named after  Helen of Troy
Discovery date  15 August 1868
Observation arc  145.07 yr (52986 d)
Orbits  Sun
Discoverer  James Craig Watson
Discovery site  Detroit Observatory
Aphelion  2.94606 AU (440.724 Gm)
Perihelion  2.22353 AU (332.635 Gm)
Similar  161 Athor, 114 Kassandra, 128 Nemesis, 107 Camilla, 132 Aethra

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 71×63×63 ± 16% km. The diameter estimated from IRAS infrared measurements is 66 km. It is classified as an S-type asteroid in the Tholen system.


101 Helena Wikipedia