(101) Helena
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.