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Discovery
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| Discovered by | Auguste Charlois |
| Discovery date | August 25, 1897 |
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Designations
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| Named after | Hippo Regius |
| Alternate name(s) | 1897 DH |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 477.289 Gm (3.19 AU) |
| Perihelion | 386.554 Gm (2.584 AU) |
| Semi-major axis | 431.921 Gm (2.887 AU) |
| Eccentricity | 0.105 |
| Orbital period | 1791.881 d (4.91 a) |
| Average orbital speed | 17.53 km/s |
| Mean anomaly | 128.076° |
| Inclination | 19.54° |
| Longitude of ascending node | 311.733° |
| Argument of perihelion | 218.928° |
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Physical characteristics
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| Dimensions | 127.0 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) | 8.42 |
426 Hippo is a very large main-belt asteroid.
It was discovered by Auguste Charlois on August 25, 1897, in Nice.
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