155 Scylla

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155 Scylla is a main-belt asteroid about 33–40 kilometers wide. It orbits the Sun every 4.58 years at a distance of roughly 2.76 astronomical units, in a slightly oval and tilted path (eccentricity ~0.28, inclination ~11.4°). It was discovered by Austrian astronomer Johann Palisa at the Austrian Naval Observatory on 8 November 1875 and named after Scylla from Greek mythology. Soon after its discovery it was lost and not re-identified for about 95 years until Paul Wild of Bern, Switzerland, found it again using an ephemeris prepared in 1970 by Conrad Bardwell. In 2008, photometric observations showed a rotation period of about 7.96 hours with a brightness swing of roughly 0.46 magnitudes, suggesting an irregular shape. The surface is very dark (albedo around 0.02–0.05), and the asteroid is classified as an X-type. Its absolute magnitude is around 11.2–11.4.