299 Thora
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| Discovery A | |
|---|---|
| Discoverer | Johann Palisa |
| Discovery date | October 6, 1890 |
| Alternate designations B |
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| Category | Main belt |
| Orbital elements C | |
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| Eccentricity (e) | 0.062 |
| Semi-major axis (a) | 364.127 Gm (2.434 AU) |
| Perihelion (q) | 341.515 Gm (2.283 AU) |
| Aphelion (Q) | 386.739 Gm (2.585 AU) |
| Orbital period (P) | 1387.017 d (3.8 a) |
| Mean orbital speed | 19.09 km/s |
| Inclination (i) | 1.601° |
| Longitude of the ascending node (Ω) |
241.63° |
| Argument of perihelion (ω) |
150.489° |
| Mean anomaly (M) | 31.11° |
| Physical characteristics D | |
| Dimensions | 17.0 km |
| Mass | unknown |
| Density | unknown |
| Surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Spectral class | unknown |
| Absolute magnitude | 11.4 |
| Albedo (geometric) | unknown |
| Mean surface temperature |
unknown |
299 Thora is a typical Main belt asteroid.
It was discovered by Johann Palisa on October 6, 1890 in Vienna.
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