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Discovery
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| Discovered by | Karl Wilhelm Reinmuth |
| Discovery date | September 22, 1928 |
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Designations
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| Named after | Arnica |
| Alternate name(s) | 1928 SD |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 461.759 Gm (3.087 AU) |
| Perihelion | 405.322 Gm (2.709 AU) |
| Semi-major axis | 433.541 Gm (2.898 AU) |
| Eccentricity | 0.065 |
| Orbital period | 1802.001 d (4.93 a) |
| Average orbital speed | 17.48 km/s |
| Mean anomaly | 352.152° |
| Inclination | 1.034° |
| Longitude of ascending node | 304.386° |
| Argument of perihelion | 20.435° |
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Physical characteristics
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| Dimensions | ? km |
| Mass | ?×10? kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | ? d |
| Albedo | ? |
| Temperature | ~163 K |
| Spectral type | ? |
| Absolute magnitude (H) | 11.0 |
1100 Arnica is a minor planet orbiting the Sun. Initially it received the designation 1928 SD. It was named for the Arnica genus of plants.
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