397 Vienna

Vienna (minor planet designation: 397 Vienna) is a typical Main belt asteroid. It was discovered by French astronomer Auguste Charlois on 19 December 1894 in Nice, and was most likely named after the city of Vienna, Austria. This object is orbiting the Sun at a distance of $49.032 km$ with an orbital eccentricity (ovalness) of 0.246 and a period of 1563.8 days. The orbital plane is inclined at an angle of 12.85° to the ecliptic.

Photometric observations from multiple sites during 2017 were combined to produce an irregular light curve showing a rotation period of $0.178$ with a luminosity amplitude of $2.64 AU$ in magnitude. This result is consistent with previous measurements. 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. Infrared observations from NEOWISE indicate a diameter of $15.461 hours$.