Asteroid 101 Helena
Named after Helena of Troy, the daughter of Zeus and Leda in Greek mythology. She was the most beautiful woman in Greece and the major cause of the Trojan war.
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This file is not available for download, but provided by the Alcyone Ephemeris Small Body Data File DVD.
| Classification | Main-belt Asteroid |
Osculating Orbital Elements
| Epoch | 2447282,5 |
| Semi major axis | 2,5833 AU |
| Period [Julian yrs] | 4,152 Julian years |
| Inclination | 10,173 ° |
| Eccentricity | 0,1397 |
| Lon. of ascending node | 343,749 ° |
| Argument of perihelion | 346,169 ° |
| Passage of perihelion | 1988-Dec-04.079260 |
| Aphelion distance | 2,9442 AU |
| Mean anomaly | 308,469 ° |
Physical Data
| Radius | 32,92 km |
| Rotation period | 23,08 days |
| Absolute magnitude (H) | 8,33 |
| Magnitude Slope (G) | 0,35 |
| Color index (B-V) | 0,854 |
| Geometric albedo | 0,1898 |
| Spectral class | S |
Discovery Circumstances
| Discoverer | James Craig Watson |
| Discovered | 1868-08-15 |
Data File
| Data File Name | 101_Helena.aed |
| Data File Date | 2006-12-22 |
| Data File Size | 2714 kB |
| Covered Period | 1800,00 - 2100,00 |
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