| Minorplanet: | yes |
| Background: |
|
| 778 Theobalda | |
| Mpc Name: | (778) Theobalda |
| Alt Names: | 1914 UA |
| Mp Category: | main belt,Theobalda family |
| Discovered: | 25 January 1914 |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Eccentricity: | 0.24990 |
| Semimajor: | 3.1874AU |
| Perihelion: | 2.3909AU |
| Aphelion: | 3.9839abbr=onNaNabbr=on |
| Period: | 5.69 yr (2078.5 d) |
| Inclination: | 13.687° |
| Asc Node: | 321.708° |
| Arg Peri: | 134.392° |
| Mean Motion: | / day |
| Observation Arc: | 92.58 yr (33816 d) |
| Uncertainty: | 0 |
| Abs Magnitude: | 9.66 |
| Rotation: | 11.659abbr=onNaNabbr=on |
| Moid: | 1.42779AU |
| Jupiter Moid: | 1.30066AU |
| Tisserand: | 3.105 |
778 Theobalda is a minor planet orbiting the Sun, in the main asteroid belt. It was discovered by Franz Kaiser on 25 January 1914 and was named after his father, Theobald Kaiser. This is an F-type asteroid that spans ~64 km in girth. It rotates on its axis once every 11.7 hours. 778 Theobalda is orbiting from the Sun with an eccentricity (ovalness) of 0.25 and a period of 2078.52NaN2. The orbital plane is inclined at an angle of 13.7° to the plane of the ecliptic.
778 Theobalda is the namesake and largest member of a family of 128 minor planets in the outer belt. The Theobalda asteroid family was likely formed million years ago from a collision-shattered parent body that had a diameter of around .