154 Bertha
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| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 3.189 AU |
| Perihelion distance | 2.920 AU |
| Aphelion distance | 3.459 AU |
| Orbital period | 5.70 years |
| Inclination | 21.03° |
| Eccentricity | 0.084 |
| Physical characteristics 1 | |
| Diameter | 184.93 km |
| Rotation period | 12 hours |
| Spectral class | C |
| Abs. magnitude | 7.58 |
| Albedo 4 | 0.048 |
| History 2 | |
| Discoverer | P. M. Henry, 1875 |
154 Bertha is a very dark and very large outer Main belt asteroid.
It was discovered by brothers Paul Henry and Prosper Henry on November 4, 1875, but the credit from the discovery was given to Prosper. It is probably named after Berthe Martin-Flammarion, sister of the astronomer Camille Flammarion.
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