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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | March 31, 1886 |
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Designations
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| Named after | Opava |
| Alternate name(s) | A904 EC, A924 TA, 1938 VC, 1938 XC, 1945 GD, 1951 SG |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 443.748 Gm (2.966 AU) |
| Perihelion | 377.374 Gm (2.523 AU) |
| Semi-major axis | 410.561 Gm (2.744 AU) |
| Eccentricity | 0.081 |
| Orbital period | 1660.616 d (4.55 a) |
| Average orbital speed | 17.98 km/s |
| Mean anomaly | 74.62° |
| Inclination | 9.486° |
| Longitude of ascending node | 13.774° |
| Argument of perihelion | 152.96° |
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Physical characteristics
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| Dimensions | 57.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Albedo | 0.0374 |
| Temperature | unknown |
| Spectral type | P |
| Absolute magnitude (H) | 10.39 |
255 Oppavia is a sizeable Main belt asteroid. It classified as a dark P-type asteroid.
It was discovered by Johann Palisa on March 31, 1886 in Vienna and was named after Opava, town in the Czech Republic (then part of Austria-Hungary), where Palisa was born.
Oppavia was long thought to be a member of the now defunct Ceres asteroid family, but was found to be an unrelated interloper on the basis of its non-matching spectral type.
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