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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | April 17, 1888 |
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Designations
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| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 499.623 Gm (3.34 AU) |
| Perihelion | 431.765 Gm (2.886 AU) |
| Semi-major axis | 465.694 Gm (3.113 AU) |
| Eccentricity | 0.073 |
| Orbital period | 2006.1 d (5.49 a) |
| Average orbital speed | 16.88 km/s |
| Mean anomaly | 168.822° |
| Inclination | 21.645° |
| Longitude of ascending node | 211.301° |
| Argument of perihelion | 268.386° |
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Physical characteristics
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| Dimensions | 122.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Albedo | unknown |
| Temperature | unknown |
| Spectral type | PC |
| Absolute magnitude (H) | 8.56 |
276 Adelheid is a very large main-belt asteroid. It is classified by IRAS satellite as a combination of P-type and C-type asteroids and so is probably composed of primitive carbonaceous materials.
It was discovered by Johann Palisa on April 17, 1888, in Vienna.
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