 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 19 December 1894 |
| Designations | |
| (397) Vienna | |
| Pronunciation | /viˈɛnə/[1] |
Named after | Vienna |
| 1894 BM | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 117.45 yr (42,900 d) |
| Aphelion | 3.28657 AU (491.664 Gm) |
| Perihelion | 1.98686 AU (297.230 Gm) |
| 2.63671 AU (394.446 Gm) | |
| Eccentricity | 0.24646 |
| 4.28 yr (1,563.8 d) | |
| 202.358° | |
| 0° 13m 48.731s / day | |
| Inclination | 12.8534° |
| 227.935° | |
| 139.975° | |
| Physical characteristics | |
| Dimensions | 49.032±1.055 km |
| 15.48 h (0.645 d) | |
| 0.1776±0.015 | |
| 9.31 | |
397 Vienna is a typical Main belt asteroid. It was discovered by French astronomer Auguste Charlois on 19 December 1894 in Nice. It was most likely named after the city of Vienna, Austria.[3] This object is orbiting the Sun at a distance of 2.64 AU with an orbital eccentricity (ovalness) of 0.246 and a period of 4.28 yr. The orbital plane is inclined at an angle of 12.85° to the ecliptic.[2]
Photometric observations from multiple sites during 2017 were combined to produce an irregular light curve showing a rotation period of 15.461±0.001 h with a luminosity amplitude of 0.16±0.02 in magnitude. This result is consistent with previous measurements.[4] The Tholen spectral type of this object is S and the SMASSII spectral type is K. Although the 'S' class suggests a stony composition, the latter class is consistent with carbonaceous chondrite meteorites.[5] Infrared observations from NEOWISE indicate a diameter of 49 km.[2]
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