| Minorplanet: | yes |
| Background: |
|
| 545 Messalina | |
| Mpc Name: | (545) Messalina |
| Pronounced: | or [1] |
| Alt Names: | 1904 OY |
| Discovered: | 3 October 1904 |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Eccentricity: | 0.16912 |
| Semimajor: | 3.2014AU |
| Perihelion: | 2.66AU |
| Aphelion: | 3.7428abbr=onNaNabbr=on |
| Period: | 5.73 yr (2092.2 d) |
| Inclination: | 11.204° |
| Asc Node: | 333.638° |
| Arg Peri: | 330.686° |
| Mean Motion: | / day |
| Orbit Ref: | [2] |
| Observation Arc: | 111.54 yr (40741 d) |
| Uncertainty: | 0 |
| Abs Magnitude: | 8.84 |
| Rotation: | 7.2abbr=onNaNabbr=on |
| Mean Radius: | km |
545 Messalina is a minor planet, specifically an asteroid orbiting primarily in the asteroid belt. It was discovered on 3 October 1904 by Paul Götz (provisional name 1904 OY), at Heidelberg. It is named after Valeria Messalina, the third wife of Roman Emperor Claudius.[3] [4] [5]