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Discovery
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| Discovered by | C. H. F. Peters |
| Discovery date | October 22, 1879 |
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Designations
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| Named after | Dido |
| Alternate name(s) | A909 AB, A909 GB, A912 RB |
| Minor planet category |
Main belt |
| Adjective | Didonian |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 501.211 Gm (3.35 AU) |
| Perihelion | 440.569 Gm (2.945 AU) |
| Semi-major axis | 470.89 Gm (3.148 AU) |
| Eccentricity | 0.064 |
| Orbital period | 2039.771 d (5.58 a) |
| Average orbital speed | 16.79 km/s |
| Mean anomaly | 287.741° |
| Inclination | 7.181° |
| Longitude of ascending node | 0.844° |
| Argument of perihelion | 250.781° |
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Physical characteristics
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| Dimensions | 160.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 8 h |
| Albedo | 0.035 |
| Temperature | unknown |
| Spectral type | C |
| Absolute magnitude (H) | 8.24 |
209 Dido is a very large main-belt asteroid. It is classified as a C-type asteroid and is probably composed of privitive carbonaceous materials. Like many asteroids of its type, it has an extremely low albedo.
It was discovered by C. H. F. Peters on October 22, 1879 in Clinton, New York and was named after the mythical Carthaginian queen Dido.
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