101 Helena
 |
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | August 15, 1868 |
| Designations | |
Named after | Helen of Troy |
| Main belt | |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 441.092 Gm (2.949 AU) |
| Perihelion | 331.683 Gm (2.217 AU) |
| 386.387 Gm (2.583 AU) | |
| Eccentricity | 0.142 |
| 1516.159 d (4.15 a) | |
Average orbital speed | 18.44 km/s |
| 125.599° | |
| Inclination | 10.199° |
| 343.471° | |
| 347.818° | |
| Physical characteristics | |
| Dimensions | 65.8 km |
| Mass | 3.0×1017 kg |
Mean density | 2.0 g/cm³ |
| 0.0184 m/s² | |
| 0.0348 km/s | |
| ? d | |
| Albedo | ? |
| Temperature | ~173 K |
Spectral type | S |
| 8.33 | |
101 Helena is a fairly small, rocky main-belt asteroid. It was discovered by J. C. Watson on August 15, 1868. It is named after Helen of Troy in Greek mythology.
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