| Minorplanet: | yes |
| Background: |
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| 255 Oppavia | |
| Discovered: | 31 March 1886 |
| Mpc Name: | (255) Oppavia |
| Alt Names: | A886 FB, 1904 EC 1924 TA, 1938 VC 1938 XC, 1945 GD 1951 SG |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Eccentricity: | 0.077427 |
| Inclination: | 9.47209° |
| Asc Node: | 13.6708° |
| Arg Peri: | 156.011° |
| Avg Speed: | 17.98 km/s |
| Rotation: | 19.499abbr=onNaNabbr=on |
| Abs Magnitude: | 10.39 |
| Mean Motion: | / day |
| Uncertainty: | 0 |
255 Oppavia is a sizeable Main belt asteroid. It was discovered by Austrian astronomer Johann Palisa on 31 March 1886 in Vienna and was named after Opava, a town in the Czech Republic, then part of Austria-Hungary, where Palisa was born. It is orbiting the Sun at a distance of with an orbital eccentricity (ovalness) of 0.077 and a period of 1662.12NaN2. The orbital plane is inclined by an angle of 9.47° to the plane of the ecliptic.
Photometric observations made during 2013 indicate a synodic rotation period of with an amplitude of 0.16 in magnitude. The unusual light curve shows three uneven minima and maxima per cycle. In 1995, 255 Oppavia was suggested as a peripheral 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. It classified as a dark X-type asteroid in the Tholen taxonomy.