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Discovery
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| Discovered by | Auguste Charlois |
| Discovery date | December 19, 1894 |
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Designations
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| Named after | Vienna |
| Alternate name(s) | 1894 BM |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 491.295 Gm (3.284 AU) |
| Perihelion | 297.033 Gm (1.986 AU) |
| Semi-major axis | 394.164 Gm (2.635 AU) |
| Eccentricity | 0.246 |
| Orbital period | 1562.13 d (4.28 a) |
| Average orbital speed | 18.35 km/s |
| Mean anomaly | 315.367° |
| Inclination | 12.835° |
| Longitude of ascending node | 228.271° |
| Argument of perihelion | 139.451° |
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Physical characteristics
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| Dimensions | 43.3±1.8 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 15.48 h |
| Albedo | 0.178±0.015 |
| Temperature | unknown |
| Spectral type | unknown |
| Absolute magnitude (H) | 9.31 |
397 Vienna is a typical Main belt asteroid. The Tholen spectral type is S and the SMASSII spectral type is K.
It was discovered by Auguste Charlois on December 19, 1894 in Nice.
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