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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | April 19, 1882 |
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Designations
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| Alternate name(s) | n/a |
| Minor planet category |
Main belt (Cybele) |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 641.471 Gm (4.288 AU) |
| Perihelion | 370.46 Gm (2.476 AU) |
| Semi-major axis | 505.966 Gm (3.382 AU) |
| Eccentricity | 0.268 |
| Orbital period | 2271.87 d (6.22 a) |
| Average orbital speed | 16.2 km/s |
| Mean anomaly | 215.046° |
| Inclination | 20.902° |
| Longitude of ascending node | 197.199° |
| Argument of perihelion | 104.697° |
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Physical characteristics
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| Dimensions | 121.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 7.356 h |
| Albedo | .040 |
| Temperature | unknown |
| Spectral type | C |
| Absolute magnitude (H) | 8.72 |
225 Henrietta is a very large outer main-belt asteroid. It is classified as a C-type asteroid and is probably composed of privitive carbonaceous material. It has very dark surface.
It belongs to Cybele group of asteroids and is probably in 4:7 orbital resonance with planet Jupiter.
It was discovered by Johann Palisa on April 19, 1882, in Vienna and named after Henrietta, wife of astronomer Pierre J. C. Janssen.
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