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Discovery
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| Discovered by | Max Wolf |
| Discovery date | September 7, 1896 |
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Designations
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| Alternate name(s) | 1896 CY |
| Minor planet category |
Main belt (Cybele) |
| Epoch 23 July 2010 (JD 2455400,5) | |
| Aphelion | 3,55326416 AU |
| Perihelion | 3,3073759 AU |
| Semi-major axis | 3,43032003 AU |
| Eccentricity | 0.036 |
| Orbital period | 2320.6 d (6.35 a) |
| Average orbital speed | 16.07 km/s |
| Mean anomaly | 246.1262° |
| Inclination | 6.642° |
| Longitude of ascending node | 243.086° |
| Argument of perihelion | 228.387° |
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Physical characteristics
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| Dimensions | 141.25 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 11,04 h |
| Albedo | 0,042 |
| Temperature | unknown |
| Spectral type | P |
| Absolute magnitude (H) | 8.31 |
420 Bertholda is a very large main-belt asteroid. It is classified as a P-type asteroid.
It was discovered by Max Wolf on September 7, 1896, in Heidelberg.
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