397 Vienna is a typical Main belt asteroid.

It was discovered by French astronomer Auguste Charlois on 19 December 1894 in Nice.

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.

[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.