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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | October 6, 1890 |
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Designations
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| Named after | Thor |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 386.739 Gm (2.585 AU) |
| Perihelion | 341.515 Gm (2.283 AU) |
| Semi-major axis | 364.127 Gm (2.434 AU) |
| Eccentricity | 0.062 |
| Orbital period | 1387.017 d (3.8 a) |
| Average orbital speed | 19.09 km/s |
| Mean anomaly | 31.11° |
| Inclination | 1.601° |
| Longitude of ascending node | 241.63° |
| Argument of perihelion | 150.489° |
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Physical characteristics
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| Dimensions | 17.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Albedo | unknown |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 11.4 |
299 Thora is a typical Main belt asteroid.
It was discovered by Johann Palisa on October 6, 1890 in Vienna.
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