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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | October 4, 1885 |
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Designations
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| Alternate name(s) | A907 UA, 1950 RH1, 1953 FN1 |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 511.622 Gm (3.42 AU) |
| Perihelion | 413.717 Gm (2.766 AU) |
| Semi-major axis | 462.669 Gm (3.093 AU) |
| Eccentricity | 0.106 |
| Orbital period | 1986.59 d (5.44 a) |
| Average orbital speed | 16.94 km/s |
| Mean anomaly | 258.426° |
| Inclination | 10.527° |
| Longitude of ascending node | 156.314° |
| Argument of perihelion | 287.098° |
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Physical characteristics
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| Dimensions | 28.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 20.216 h |
| Albedo | 0.219 |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 10.0 |
251 Sophia is a main belt asteroid.
It was discovered by Johann Palisa on October 4, 1885 in Vienna and was named after Sophia, wife of astronomer Hugo von Seeliger.
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