(101) Helena
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Asteroid (101) Helena |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main belt asteroid |
| Major semi-axis | 2.582 AU |
| eccentricity | 0.142 |
| Perihelion - aphelion | 2.216 AU - 2.948 AU |
| Inclination of the orbit plane | 10.2 ° |
| Length of the ascending node | 343.5 ° |
| Argument of the periapsis | 347.3 ° |
| Time of passage of the perihelion | September 11, 2009 |
| Sidereal period | 4 a 54 d |
| Mean orbital velocity | 18.4 km / s |
| Physical Properties | |
| Medium diameter | 66 km |
| Albedo | 0.19 |
| Rotation period | 23.1 h |
| Absolute brightness | 8.3 mag |
| Spectral class | S. |
| history | |
| Explorer | JC Watson |
| Date of discovery | August 15, 1868 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(101) Helena is an asteroid of the main belt . It was named after the beautiful Helena , a daughter of Zeus and Leda . The asteroid was discovered on August 15, 1868.